fuel tank

Hey all, Been searching for a while and I simply can't find any documentation or labeling about something I'm looking to identify on my fuel tank and was hoping you all could help me out. Long story short, I recently bought a '75 CB750F which has a '78 CB750K fuel tank mated to it. Everything...

Trying to locate reproduction/replacement tanks for 1981 CB900F. 20L/5.3USG. Any advice on where to find good quality items to approximate the original or at least right size. Open to seat mods etc to accommodate fit. Thanks.

Where do i get a fuel tank lock at? I bought a tank off of ebay thas has fuel door but no keys. Is there a cheat around this? I have w sets of other keys and a fuel cap key from another bike. No sure how to fix this issue. New to thw CB world. Thanks