According to the FAA Publication you should file as
B72Q/M-SDFGHIRWXYZ/S Not B721/M-SDFGHIRWXYZ/S
its that that makes you the stage III and differentiates for want of a better term from the Fed Ex & Raisbeck Stg III Mod. PM me your email and I'll send the OSL over. In fact I'll send you them all its about 3.5 mb
Ernie Loake was the 'God' on the installations but he has long retired now, I think they brought him back just to cover the last kit Installation. If you have flow 3 of these puppies then our paths have crossed if not bloody close.