Trapperty, you had enquired about source for 7GCBC gear bolts. It depends: Is this the flat steel springs (Steve Wittman/Cessna) undercarriage, or the oleo-strut "no-bounce" with fabric covered vee's?
The no-bounce should be standard AN hardware, and as I recall bronze bushings. You folks who actually KNOW what they're talking about jump in here.
The flat steel undercarriage, which started c.a. 1966?? has three different gear-bolt attachment variants. Talking about the attach at the lower longeron, not the 'tongue' up in the gear box, which should also be carefully inspected.
The first variant was a bent piece of threaded steel rod. Cheap, easy, poor design, prone to cracking. Had two of 'em break on me on Scouts (same design, just taller, stiffer gear), right at the bends, which is a stress-riser point.
The second variant was from Champion, which was a bent-U forging, with standard nuts. Only had ONE of them break on me. The third is the one from Univair, which uses a piece of flat barstock, and high-grade MS bolts and nuts. NEVER had one of those break on me. I don't know what ACA is now using on their new ones. Worth contacting them.
The breaks each felt like a light tap on my heel. Caught the first one on the next preflight. Caught the second one on the postflight, and caught the third one on landing rollout, after the light "tap" on my heel resting on floorboards, remembering what it felt like.
The thing that saved my butt on all three was the previously installed steel rod "cage", which prevented the main gear from rotating aft much. None of these were heavy landings, but there was some moderately rough ground on the principle field, and high landing cycles per hour.
And I DID once have a main gear leg break just outboard of the longeron, which spoiled my whole day, not to mention that wing, the prop, and an engine teardown...
NDT proved a crack at the radius just outboard of lower longeron, disguised under dark colour paint; due to previous "abusive grinding", not reflected in logbooks. Tip o' the day: If you've got spring steel undercarriage, paint it WHITE! And preflight like it was a 100 Hour inspection, especially main and aft undercarriage.
Some of the high-volume Canadian operators keep an entire spare set of gear legs on hand, and send them off for NDT.
The more common trouble spot is cracks at the wheel attach points, so check that carefully, too, eh?
Looks like you're on the right track, doing it right, and asking the right questions on the right forum. All the best!
Thanks, eh? cubscout