They are pretty hard to find so I doubt you will have much luck.  I sold all the ones I had from a repair center buy out months ago.

It is very easy to remove them.  You just have to take the system apart to do it though.  Then like 2 tiny little screws hold them on.  When I sold my doors, I got like 5 each for them I think.  They are nearly impossible to find brand new like I had.  God I still have so many spare parts.  I really need to do something with them all.