I bought an ADCO last Fall for my Roo19. Got the smallest one, I believe. It was still a couple feet too long. Some advice: I never thought about the gutter extensions; they poked holes IMMEDIATELY. Went back and put some tennis balls on them, but the damage was done. Also put a ball on the lever for the awning; it came off sometime during the winter(will probably wire it on next year). Fortunately (?) I didn't have the cover pulled forward all the way, so I'm hoping next fall when I put it back on and pull it foward, the tennis balls will be on good material. A few minor holes I don't think will hurt anything. We'll see.