Hello Mark, I was thinking that they sounded similar to the ones you described from the 80's. It would be nice to know if they would fit a ten gauge as is, but unfortunately I don't own one to compare them with. Nearly all N.O.S. parts I purchase for these old gals require some final fitting. Hammer and Top Lever Springs in particular. Not having a lathe, all the modifications I made to the firing pin were the result of hand filing. May have taken two hours, total, but part of that was determining what should be controlling dimensions. Now that I've worked that out in my wee little brain, I could likely do it in about an hour. Small price for keeping one of these guns in the game. Thanks, John