There's a few 5thA's remaining in my local yard. But they've all been there at least 20 years, so not 100% certain I'd trust their electrical to be good, or which years which one's even are. But I am half way closer than IA. Personally, in that range I only have my 84 and 89 5th's, and also 86 and 87 columns hanging from the trusses. I'm not entirely familiar with the later M's despite owning them. But I was told the columns changed in 81 and 84, then some time in 88, and again in 89 for the air bag. I didn't know the plugs would work despite the different colored wires, but according to another friend an 81 turn signal switch wouldn't work in an 80. How true all of that is, or maybe where he went wrong, I've no idea. Just what I'm told. So if my friends are correct any 81-83 should work for you and provide a decent range of years to maintain it. And if yours doesn't come through for you I could try climbing into some of the local ones through which ever window is open and kick the doors til the frozen shut latches give so I can check the door stickers for the right year range of build. As long as the driver door window isn't down or the windshield missing, they might be OK.