Hello!

Turn signal lever was loose on our coach and horn was randomly giwing beebs when tight turn to right.
I pulled off steering wheel and lock plate etc, found that groove where black tube locks on white plastic part was broken (part that moves with steering wheel, turn signal cancel cam?). I found new HELP part for that locally, so one problem solved.
Next tried to tighten turn signal lever screw but it has pulled threads off.
I think that we need new turn signal switch. Whats original GM part# for reference to 1977 coach or what car to look for in catalog?
Part monkeys had several most common Standard Motors parts in stock here in Finland, but I don´t want to drive 500 km to compare old part to new because I´m sure somebody here knows right partnumber.

Jake