I have a 1975 Challenger Mark III, my grandfather bought it brand new. I have been around the boat all my life but never really ask any questions about it, at that time it didn't matter to me as long as it floated, now he has Alzheimer and doesn't even really know who I am much less any thing about the boat. I have searched everywhere on the net and hear in town that I can thing of to find out info. about the boat with no luck. Any info on the boat or where I could get parts would be great.