I have my original 105 GTV fuel tank but it is fairly beat-up. I bought a new replacement tank but it is for a spider (with the smaller neck). Should I have my original tank repaired or cutoff the neck and have it attached to the replacement tank. The replacement tank is a bit larger and for non SPICA fuel delivery. My tank is for SPICA. The replacement tank (as it stands) will not fit the 105 chassis as the filler neck will fall way short of the fuel door-flap opening.