Are you looking for a lock for the L-bracket drop on the hitch or a lock to attach the Pakit Rak platform to the L-bracket?
When I purchased my Pakit Rak 4 years ago now, the L-bracket that attaches to the vertical hitch had standard 1/2" hole that I could use a 1/2" locking pin on.
The Pakit Rak platform (and lower mating hole of the L-bracket) however were a smidge smaller than 1/2" (I don't remember how much smaller but a 1/2" locking pin would not fit). The rack came with a spring locked pin but I wanted to lock that platform to the L-bracket which was locked to the hitch. So I just chucked in a 1/2" bit into my DP and drilled out the platform and mating L-bracket holes to 1/2". I now have 2 pin locks for the Pakit Rak. One locks the L-bracket to the hitch and the other locks the platform to the L-bracket. Works great!
I bought a Packit Rak a while back that works with a trailer hitch but can't find a lock that will fit it anyone have any luck finding one?