Ted,
Nope.... the lower, or bottom rubber boot that keeps the water and such out is what I was referring, too. I know of no available sources, so a little ingenuity is required.... I don't like the heat blowing out around the upper boot when driving down the road, let alone any water or dirt that can come up in the cab, as well.
Glad you're liking it. The only new truck I've ever owned personally was a '96 extended cab 2x4 2500.... I loved that thing. Killed it like an idiot racing in the rain, one night.... But I bought another one just like it, and drove it 290k on top of the 89k it had on it when I got it in 2000..... I sold it to a buddy who put a flatbed on it and keeps it under a trailer. Also bought a '97 4x4 3500 that I still have, and it just won't die!! First engine went 189k before I pulled it due to a cracked head, smoked transmission, and the fact I found a low mileage mid-range engine out of a Furd F650. Add a NV5600, rebuilt T-case, DewEze bale bed, and locking hubs, and she's a workhoss. That engine has 250k on it, now. I kept the 3.54 gears in all mine, I just upped the fueling and air flow, so I don't have any problems pulling much of anything legal..... Occasionally, I might run out of radiator, but only when I keep it above 40lbs boost or so for too long..... It's hard to beat those old 12v engines, even with a stick!!!