I bought a freshly rebuilt TA-66 P trim from NCturbos a few months back. When I bought the turbo I planned to run it in a local race class that required a stock appearing turbo so I bought a Garrett housing from Bison to replace the PTE housing on the turbo. I went to put the Garrett housing on the turbo but it did not fit so I thinking the turbo might be a Q trim wheel instead of a P trim. The PTE housing from the turbo measures 79.25mm and the Garrett housing 74.94. Any help would be appreciated.