Originally Posted by Laona
The black olastic 90 is cracked on nearly all 3 slides. What advise is there of the repair. I thought of having black aluminum bent to a 90 and replacing the plastic
These are called "wear strips" or slide out plastic by Forest River. Had to replace them on one slide which was pretty straight forward. All you need is some butyl tape, and something to jack the slide up about an inch or two to give you space to remove and place the new part.
LH p/n 10-03354A, RH 10-03356A, cost me $10.52 ea last year.
I wouldn't spend the effort to try and fabricate anything with replacement parts being this cheap.
I ordered my through Forest River support. Hope this helps.