A quick learner from Illinois says:
November 6, 2012
I have older Merrilat cabinets that have the stops broken off of the track. the stop is just a piece of the track that is cut and pulled down. the U shaped track is 18.75 in. long with a part # 32-078 drawer guide at the back end I need some new track do you have that part ?
Tom from SWISCO responded:
November 8, 2012
Thank you for posting. Unfortunately, I don't believe we have this exact track. You may want to consider replacing the whole track system. However, I'm not sure if this is a side load track or a bottom load track. If it's a bottom load track, take a look at our 32-063 Complete Drawer Track Kit and see if this will work for you. If it's a side load, you may want to consider our Self-Closing Drawer Side Track Kits and see if any of these could work.