Trying to find out different types of tanks for the 650's

[Moisstink]

I have switched out the gas tank on my bike to a xs550 tank and am selling my current tank. I am not sure the year for the tank and am wondering how many variations of xs650 tanks there were. The bike I bought is a 1975 but mods were done to it by the PO. I will be posting this in the sale section but I this is a really nice tank that I am getting rid of if anyone is interested. 120 plus S/H I am attaching photos of the tank so if anyone knows what year it is I would appreciate it. And if you want it PM me.

Thanks,
Kevin

 

[650Skull]

I think its a 77D.

Later 78/79 Standard Tanks had Vacuum petcocks and the mount as flush with the tank where as yours protrudes