I'm about to burst your bubble Scud and put this to bed forever and add to the data base. I have 2 second hand and one brand new (never seen fuel) later tanks and 1 brand new (never seen fuel) old style tanks and the original on my bike. I have just laid the tape measure on my original tank and brand new late tank and i can tell you they are dimensionally very different. I'll post some images with tape measures attached so we can align with your frame length images. My feeling is