fuel tank options

Hi guys,

I'm in need of information regarding the availability to purchase a fuel tank for a 1979 YZ250f. So far I've had no success in my searches to obtain a new replacement to complete restoration. I'm aware that the previous model tank does not fit without mounting mods. Am not sure whether the '80 model has the same tank mounting positions as the '79 model so the '80 tank will fit. Any suggestions greatly appreciated.

Regards Michael