Window caster wheels/plastic bushes

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Had to replace my window regulators and the little white plastic bushings are pretty shot and not holding the window,

 

I know the part number 535837437 shows that it was discontinued in 2010, is there anywhere they can still be bought? I have the I pro style mechanisms, so if there's some other option I'm happy to be enlightened!

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Are these whatcha lookin for?

 

http://direct.the-corrado.net/showthread.php?58587-Window-Rollers-on-hiatus-due-to-c*ck-up