I´ve got many vintage RC cars and its very difficult to find spare parts for theese discontinued models. I needed a replacement for a lost wing support for a Multiplex Lighning off-raod car (Thunder Tiger clone). I took the User Manual to take the shape for the part, some small adjustments and finally a succesfull design :)

This is the last one i´ve done, but ther will be more in a short term, probably... there´re many candidates, many with more than 20y since made:
Kyosho Rampage GP
Kyosho Lazer Alpha
Kyosho Pure Ten Alpha
Thunder Tiger TS4-n

It would be nice to find more maklers/designers interested in creating part for theese models.