Omnium CXC V2 Sliding Inserts

Here's what Omnium has to say:

Spare inserts for CXC V2 & V2.1 frames with sliding drop outs.

CXC v2.0 came with QR and CXC V2.1 came with TA, but both are interchangeable so that you can set up the rear with what ever drop out you want.