Ha Ha Sylvain
.....these were the type of controls a driving instructor uses, which are a brake pedal and a clutch pedal that are used from the passenger seat I have used the actual pedals themselves from a set.
As for acetal or delrin have a look on ebay there are usually loads even if it means getting it from over here.
An alternative I have used before is wheely bin plastic as it is very waxy.....cut out several "washers" with a small hole saw join them together on a bolt ....bolt in lathe or drill "turn down" to bush Dia hey presto plastic bushes