Previous owner put the brown tank on which he said was from a 74 something (450-550?) and that was why he said seat gap was there. I bought this tank cause I like the way it looks and the inside is super clean of rust. Getting it on the bike wasnt too difficult, but I do agree it looks a little odd but I feel the same way about the old tank. Out of the two I like the look of the new tank more but it kind of depends what I have to do to get it working.
Either way I am hunting for project bikes so they both will find good homes.
My "plan" when I saw this tank was to sand it down and polish the elevated top part/lid flap to be very shiny give it a chromelike stripe down the top, then hit the side panels, sides of the tank and head light bucket a candy paint job.
As far as the seat I definitely will be getting it reupholstered because neighbor's cats puts some holes in it, I just want to have the fitment sorted before going that path, because depending on the color of the seat that will affect my paint color choice.
On a side note, as far as the seat this bike won't be cafe/bobber style because I like having option of carrying a passenger. That will be my next bike which hopefully can find a nice cheap 750 for. My plan for the seat is to get some super thick leather in a style similiar to how it is now but in either black or brown (if I go for brown seat might do dark green paint)
Edit: Oh and as far as the seat I haven't seen any other sohc's with this exact seat so it is very possible to be the wrong one or reupholstered at one point. It has grown on me thou and is super comfortable.
Anyways I tend to babble, but this project thread is helping me decide the direction the bike will take and appreciate all your feedback