Thule VeloSpace XT 939 Longest Bike Arm 52973 w/o barrel and lock | eBay
Towing Equipment Limited - Thule VeloCompact 927 3 bike towbar mounted bike rack. Can be adapted to carry 4 bikes through the use of the Thule 9261 extra bike adaptor. | Facebook
User manual Thule VeloCompact 4th Bike Adapter 9261 (English - 8 pages)