Product review (1 stars): I agree that these crack on the slide edge often ...
I agree that these crack on the slide edge often.  I went to the GE website after one reviewer stated they were cheaper there.  I found out that the part number has been superceded, new part number is WR32X21098, priced a little over $62.  I Googled the new part number and found an online appliance part company that sells them for $28 + shipping!  Hope this helps other GE owners!