Here's a short story:

International standard ISO 7736 defines a standard size for car audio head units and enclosures. The standard was originally established by the German standards body "Deutsches Institut für Normung" as DIN 75490, and is therefore commonly referred to as the "DIN car radio size". It was adopted as an international standard in 1984. 

Head units generally come in either "single DIN" (180 x 50 mm panel) or "double DIN" (180 x 100 mm panel) size. The depth is not standardized; as a result, some cars such as the Opel Manta / Ascona have the correct sized front aperture but will accommodate few DIN sized radios other than the original due to the shallow depth; this despite the vehicle being manufactured as late as 1988. The US standard for a DIN radio is 7" x 2" (although the actual 180 mm width converts to something like 7-3/32" so most people use 7-1/8" to allow for clearance) and the Double DIN sized radio is a 7" x 4". Some radios in Japanese Kei cars do not conform to the DIN standard however. 

For removing the unit, a pair of U-shaped devices are often used. The devices are inserted in the two pairs of holes, at either end of the stereo fascia, the action releasing the unit from the mounting and providing a pair of handles to pull the unit free. These tools vary from manufacturer to manufacturer. Becker uses a pair of key-shaped removal tools, with one hole each. Often a set of thin screwdrivers will work just as well. (End of story)

Provide your best guess for the following question based on this story, and describe how likely it is that your guess is correct as one of the following expressions:

Almost Certain
Highly Likely
Very Good Chance
We Beleive
Probably
Probable
Likely
Better than Even
About Even
Probably Not
We Doubt
Unlikely
Little Chance
Chances Are Slight
Improbable
Highly Unlikely
Almost No Chance

Give ONLY the guess and your confidence, no other words or explanation. For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>
Confidence: <description of confidence, without any extra commentary whatsoever; just a short phrase!>

Here are a few examples of questions and answers:

Question: What was a car audio head unit standard adopted?
Guess: in 1984
Confidence: <appropriate level of confidence in this guess>

Question: Is it internationally recognized?
Guess: yes
Confidence: <appropriate level of confidence in this guess>

Question: Which country created the standardization/
Guess: Germany
Confidence: <appropriate level of confidence in this guess>

Question: Which organization, specifically?
Guess: "Deutsches Institut für Normung"
Confidence: <appropriate level of confidence in this guess>

Question: What is the standard commonly referred to?
Guess: "DIN car radio size"
Confidence: <appropriate level of confidence in this guess>

Question: And its formal/technical name?
Guess: DIN 75490
Confidence: <appropriate level of confidence in this guess>

Question: What is the international standard known as today?
Guess: International standard ISO 7736
Confidence: <appropriate level of confidence in this guess>

Question: How many sizes are commonly used?
Guess: two
Confidence: <appropriate level of confidence in this guess>

Question: What are they?
Guess: "single DIN" (180 x 50 mm panel) or "double DIN" (180 x 100 mm panel) size.
Confidence: <appropriate level of confidence in this guess>

Question: What is the US standard?
Guess: 7" x 2"
Confidence: <appropriate level of confidence in this guess>

Question: What about the double DIN size?
Guess: 7" x 4"
Confidence: <appropriate level of confidence in this guess>

Question: Which area's cars don't use this standard?
Guess: Japan's
Confidence: <appropriate level of confidence in this guess>

Question: Which cars are they?
Guess: Kei
Confidence: <appropriate level of confidence in this guess>

Question: What tools allow you to remove a head unit?
Guess: a pair of U-shaped devices
Confidence: <appropriate level of confidence in this guess>

Now answer the following question in the same format.

Question: Are they universally identical?

no