Welcome to the seadoo forum Chris. I would change the Gray lines out. It sound like your on the right track. measure the length plus a little more...bring one with you to get the correct diameter. For the filters you have to remove the carburetors and disassemble them to locate the internal filter in each carb. Be careful not to tear the diagrams so as not to have to replace them. Do one at a time and keep in mind as to how it all came apart. Take pictures for later reference if necessary. You could also scrap off all the paint and 2 light coats of primer and 2 light coats of paint to keep them corrosion free. Rustoleum paint works well for me. The linkage between the carburetors pops off the one side, (rather than unscrewing it) just keep mind to all the parts and pieces. If you want you could join as a "premium member". As a premium member you can down load a authentic seadoo manual from the seadoo manual library. In the library is a variety of manuals for almost all years and models. You can view as many as you like on line as a PDF file, or download it and print it for your personal and privet use. There are operator manuals and repair manuals for you to do your own repairs on your seadoo. The repair manuals have everything from troubleshooting, repair procedures to winterizing. It contains wire diagrams torque specs and pictures for disassemble and assemble instructions. In the spec sheets it tells everything needed to maintain oil changes, spark plug gaps, carburetor rebuilds and impeller wear ring tolerances. Click on the "Seadoo Manuals" link at the top of the page for more details. If you need any help or get in a jam, we are always here to answer your questions too.
Karl
