[Richard Coutts-Smith]

In the bottom of a box of what could only be described as "Miscellaneous" parts from Tim's clearing sale last week I found 2 sets of Carbi seat/needles for a T-17-E-1. Are these specifically for this application, or do they fit any GMC 270?
Also a couple of brackets marked 31684T1, I only ask about these as the number does not seem Post War British (as the rest of the parts were), and.....it's got a "T" in it.
regards
Rich.