Indoor sliding doors now stick at the top after replacing rollers
Thanks for everyone that asked questions.  There were a few things I had to change to finally get it working.  I had just bought the house and I assumed that the previous owner had the door's rollers fitted properly, basically I had to:


Use the old wheels and brackets as the ones i purchased were not sticking out the same length
The wheels were put on the wrong side of one of the doors
The bottom guides were not screwed in the correct spot
The wheels had to be adjusted as they were not the same height


Once all of these factors were fixed the door finally worked!