Need to replace the ignition switch and lock cylinder on my 73 Challenger.
Are both parts interchangeable from 70-74 or are there variations for different years. Any good vendors to use?

you might try www.classicindustries.com

Switch... 70 and laters

Cylinder, 71 and laters... 70 and some earliers 71 got a diff locking setup on collar for the cylinder

Need to note several replacement switches are made now to match several setups, so will need to match your one ( remove one extra black wire they got for example your Chally doesn't use ). Some manufacturer include instructions sheets, but some others not.

Thanks Nacho, just wanna make sure I buy the right ones..

Here is ( for example ) one ign switch with instructions sheet, made for several diff 70s setups.

https://www.oldsobsolete.com/products-pa...rg-warner-cs82/

Good priced if you ask me BTW!

If you get it, get the instruction sheet scanned of pictured for tech references around! ( send to me LOL )

Several replacement switches got a diff rivets disposition on backelite, maybe due the extra functions like the think black wire mentioned ( which I have no idea of year and apllication ), but fits and works the same on steering column collar

( EDITING: nevermind, says out of stock )

This will be the lock you'll find on the cylinder... round press button

70s and I think some earliers 71 are a flat tab...



And release location is kinda diff on collar, like the steering collar must be to fit in it