When I replaced all the boots on my rig I could not find any aftermarket replacements, including the sweet boots from Riff Raff, Mishimoto, or BD Diesel. The boots are different than the trucks. The part #'s are a bit tricky as well. You can't simply use the number on the boot. Better to go with the schematics. Best prices are from AutonationFord.
2005 E350 RB 6.0 PSD for extended fun
1989 Landcruiser FJ62 for local fun
2011 VW TDI Golf for hwy fun