These transfer kits are new, genuine HP parts. There are two options: a transfer kit with duplexing capacity and a transfer kit without duplexing capacity.

Purchasing information:

Non-Duplexing transfer kit RM1-2759 -- This transfer kit is compatible with the following printers: HP Color LaserJet 3000, 3000N, 3600, 3600N, 3800, 3800N

Duplexing transfer kit RM1-2752 -- This transfer kit is compatible with the following printers:
HP Color LaserJet 3000DN, 3000DTN, 3600DN, 3600DTN, 3800DN, 3800DTN