RAM Mounts RAM-B-349U Motorcycle Ball Adapter with Threaded Post
S$27.00
or 3 installments of S$9.00 with 
or 3 installments of S$9.00 with
The RAM-B-349U includes a M10 x 1.25 threaded post, RAM-B-349-1U includes a M10 x 1.5 post and RAM-B-236U has a 3/8"-16 pitch male thread connected to a 1" rubber ball.