A while ago I bought an MSD 8456 Pro Billet TFI distributor for my 5.0L Dart based Ford. It didn't fit as the shaft was too big, .531". With little to no info on MSD website, I bought a TFI Street Fire distributor which had the correct shaft size of .467". There are multiple TFI billet Ford distributors on the website, do any of them have the small shaft or are they all big?