Can Selective Adaptation be used to get equipment or enchantments?
Basilisk Collar gives lifelink to equipped creature, but it doesn't have lifelink.

Correct, therefore Selective Adaptation cannot fetch Basilisk Collar. For example, if an unequipped Basilisk Collar is animated with Karn, the Great Creator's +1 ability:

+1: Until your next turn, up to one target noncreature artifact becomes an artifact creature with power and toughness each equal to its converted mana cost.

the collar itself won't have deathtouch.
While Selective Adaptation can't fetch Basilisk Collar itself, there are some non-creature non-vehicles which have either indestructible or hexproof and therefore can be fetched with Selective Adaptation, for example:

Darksteel Axe, an indestructible equipment
Lotus Field, a hexproof land
Nine Lives, a hexproof enchantment

(Credit to mreux and the Scryfall folks for the query!)