sorry. the entire oar and blade will cost 200 or more each. If they are not beat up, you sell can them for more cash than it would take to buy the right oar for the pontoon boat, which is usually 7 feet. Cutting or drilling into the shaft voids the warranty. Even if you shorten them, they will be much heavier than comparable aluminum oars. The balance point wont change that much either because the weight is in the blade. The std blades on Cataract are much larger than pontoon oar blades. Sportco has a pretty good selection of oars to choose from. Depending on the mfg of the pontoon boat, they make extensions for their oars. You can also look for a metal shorts business and buy tubing and extend the oars that came with the pontoon boat.