I recently changed the couplers on my E60. And I lost both coupler plates/ covers. I tried to find some in the store but none matched the ones shown in the parts diagram. The part number is 00E02.
I've replaced missing coupler covers on Bachmann, and other brand, cars and locos using covers from Kadee draft gear boxes. You can find the list of types here: https://www.kadee.com/dynamic_filter?main_page=index&cPath=272_230_231&sort=20a&fltPRODUCT%5B%5D=Gearboxes
Find one that's close to what you need and trim if necessary to make it fit.
Len
Unfortunately I couldn't find any close to the one that I need on there but I did find some that might work in the parts store.