haha, I see what you mean now Medyo.
Is the bike in the picture that you posted the one you are referring to ?
The tank does look like a 350f tank but the frame is obviously a 750 and it will never reach.
As I said in the last sentence of my last post, the seat held my tank in place, I removed the rear mounting bracket from the
frame to save weight as it was serving no purpose.
The front of the seat just covered the rear bracket on the tank and when the seat was pulled down tight onto the top rails, it held the tank in position. The seat was made quickly detachable in the event of needing to remove the tank.
What model and years are the motor, frame and swing arm you are using ?
All fit together quite easily but mixing and matching can cause big problems further down the line. Ask me how I know, haha.
Sam.