I just installed a new turn signal switch on my 1972 Skylark. The only problem is that I ordered the wrong part and now need to go back in and put in a different switch. The lock plate retaining ring was a bit stretched but serviceable the last time, but I'm concerned that removing it again will further compromise its function. However, I haven't been able to find a replacement under the original part GM number: 580074. Not have I been able to find a reliable cross reference. I would appreciate any help in finding a new replacement. Thanks in advance.
There's one on ebay for $20.00 which seems like a crazy price to me. I've seen them repro, I think, but can't remember where. Honestly, I've used the same ring for 5-6 removals on the same column. If it broke it would only make noise. The way it sits in the groove, it can't really be compromised. I say inspect it, tweak it into a round shape, even if it sits like a lock washer unloaded it should be ok. Just make sure when it's installed it's in the groove all around.
After you install the ring, use a small screwdriver and tap the ring into the lock plate. It's captive in the plate, it can't come out without depressing the plate.