I had an old Oregon bar that had gotten bent, and a Power Care (TriLink) bar that I got on a used saw that had a catastrophic tip sprocket failure. Both of these were typical consumer single rivet Poulan mount, 18" 62DL Lo Pro bars. I used Philbert's idea of card stock to assemble the tip & rollers so it could be slid into the bar. This worked great.
I needed a rivet, and ended up cutting a slug out of the shaft of a 1/4" bolt, and peening it down. I had to grind off one side where it was slightly too long, but otherwise is came out great. I never knew what happened to the original tip, as it got run without enough oil until I got a saw fixed up, and the rails had partly sprung after the failure. Not sure which did it in. Anyway, it came out with the rails nicely pulled in, and the bar is working great. I was surprised that the parts from the two were compatible.