I have a kitfox model IV with a Rotax 912 engine. The oil tank is too long to fit into the firewall opening and needs to be shortened. I know this will involve cutting a section out of the tank and rewelding by a certified welder. I need to know how much of the tank needs to be sectioned out and a final length dimension for the modified tank. I believe Skystar used to do this modification, but are no longer in business. I would appreciate it if anyone has this modification and can give me the oil tank dimensions. Thank you. T.W. Sullivan