I just replaced the 1" D seal on my bedroom slide. Just the front side, the rest were fine, as were the wiper seals. I went to a local RV service shop and they had pieces, so I found one that was 6' long and got off pretty cheap. I used a little silicone spray so it slid on the base fairly easy.
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD 4dr short bed Duramax w/allison
Reese Fifth Airborne air ride king pin coupler with Sidewinder