I successfully replaced a friend's broken nylon roller on a Grant 336 slide with a Swisco 7/8" Flat Shower Door Wheel 10-109
. I drilled out the riveted mounting post for the broken wheel and mounted the Swisco 10-109
using a 8-32 x 3/8" Phillips screw. The nut on the Swisco 10-109
had to be ground down about 3 mm to provide clearance to the mating slide.