Gotta love Klevin at Moss, he got right back to me and here is what is said;
"The red poly bushings are manufactured for us by a company that specializes in complete polyurethane kits for many cars. The kits come with a lubricating grease as the red poly is pretty stiff and will tend to squeak when dry.
The black poly bushings are manufactured by a different company and are a slightly softer compound. Normally I would not grease these bushings, as they seem to do well without it. They are also excellent if you want the undercarriage to remain stock looking.
I'd suggest the black bushings for street driven cars as they stiffen up the suspension, but do not transmit as much vibration as the red ones."