A good unrusted tank is fairly rare to find. I've paid $300 for 1 NOS (new old stock) tank and $700 for another. Just depends on what you can find and the deal you get. I really think $700 for a perfect NOS tank is NOT out of line if you're doing a restore. Try taking an old tank, doing perfect body work then 3 step paint with graphics and see how much you put into it especially if you farm out the work. If you just need a tank then hope you can find a better deal than $300. I think it's a matter of jumping on a decent tank when you can find one. Don't be in a hurry.
75 and 76 are identical to 77 and 78 in appearance but they have different petcocks and threads. Either one would work/interchange with the proper petcock. 75/76 petcocks are still available from Honda but I do not believe the 77/78 petcocks are available anymore (not 100% sure)
