Product review (3 stars): Another solution
If you have the same problem as most of us who are buying this (just needing the plastic connector tab for the top) than like the rest of us you're annoyed at spending 11-14 dollars on a piece of tiny plastic. I took out the whole back arm and the two pieces to a neighborhood Ace and the guy found a plastic washer and screw (maybe a plastic bolt?) for 26 cents.  It's a nylon Phillips-Slotted 6-32(size) 3/8" screw with a washer. Hope that helps.

I will update this review after awhile to see how it hold up.

update 11/27/2016-  It broke after a wine glass got caught on it while pulling out the rack. I went back to ace and bought five more sets. I found the nylon screw but couldn't find the washer. Performance wise it seems to be working very well and I do notice a difference in the dishes when this piece wasn't in during the cycles before we fixed it again. Again will update this review later on.