Soon to be released: Tamiya Suspension Mounts (TRF416/TB-03 Style) in all widths (from 1XD till 1F). Insanely great!
Also some spare parts will get a normal SP/OP number. 44mm Steel swing shafts will be also available soon.
http://sakaguchinet.dyndns.org/sites...m/hop_ups2.htm
http://sakaguchinet.dyndns.org/sites...spareparts.htm