Nice tank, yeah you need a beater tank!!!! I've got three tanks for mine. The stock little R80 G/S, a R100GS tank, less seat hook. these are nice tanks, plus the beater 43l HPN which I don't have to fill completely plus half full it carries the weight low.
I have a tank from an R65, which has been sealed and is in primer ready to paint.No dents. It's a little larger than the small G/S tank by about 1/2 gal. It does fit a G/S, but is snugger at the seat. PM me if interested.
Plus here's list of tanks