Billy the Kidd....where's your helmet?? LOL. I remember that brochure. I have to think that when the '81 Invader incorporated the improved "vari-ride" suspension first used on the '80 LTD, it also included the the higher arched ski. If nobody on here has one, you can certainly contact any of the numerous salvage places and search for a decent ski bottom from an '81 Invader or any of the '80 thru '82 LTD's.