The wheels were found around RAF Lichfield which had a hand in breaking up many thousands of aircraft. I suggested the B-17 as it was 1 of only 2 American types that I definitely know were broken up there. Having said that 51MU did handle all types for dispersal so perhaps their stores were sold during the same period? this could put in Boston/Martlet perhaps?

They also have 4 wheels that were used for trailers that in another thread have been identified as Oxford. 2 are quite bad and 2 are reasonable….