Ness Big Sucker II air cleaner with HD "bobber" a/c cover, p/n 61300120. Plain backing plate. ~4000 miles on it, so filter's a bit dirty, but complete, including instructions.$125 shipped USPS.

 

ETA- this is the kit for '99 up Twin Cam (exc. '99-'01 FI FLT & '08-up FLT).
.