Hi all. Looking to identify my Moms old bike. I know it was a 90, I think it might have been in the G3 series, but the left hand exhaust and tank profile in conjunction with the low fenders has me stumped. I know the pic isn't great, but this is from 1975-1976 out in the Mojave Desert. I believe my Dad's was a 1972 F-8 Bison. Thank you in advance!