What type of roller??

I'm pretty good with DYI projects of this nature but due to surgery recovery I only could take the closet door of and set it so far.. ideally I should be taking it to the garage and working on it there. Instead I removed it and placed it in front of one closet, so know I have very limited space to work with. Aside fr that I am restricted from certain movements!

I'm having a hard time removing the rollers. I thought it was just a matter of unscrewing an couple of screws and banging it out with a rubber mallet. But to know avail. If I bang a little harder, I might break the glass. Can you guys help me out with the issue at hand?

What is the trick to get that roller off the doors? And what part number is that? I promise to order of you.. I'd rather give my hard earn money to you than the useless folks at home depot who already told me that the rollers were universal so I ended up buying some, but after taking off the door, and comparing the both they are obviously not the same..

Here is a photo. Please advise.. also what is your lead time. Is there an expedite option?? Anxious to get this done.