The Standard wheels fitted to the No5 were 272309 Series rims that were 5.5" wide with a 33+ offset. With a 7.50-16 tyre, they fitted completely within the guard.
To increase compatibility with the Perentie fleet (and stability), AYG8108 6.0" rims with a 20.6+ offset were fitted. These do stick marginally outside the guards when checked with a straightedge, but not significantly (ie the sidewall protrudes, but not the tread). If these are the rims you have, I'd stick with them unless you are facing a particularly stringent roadworthy check. You could refer to the Repair Parts Scale to argue that these rims were fitted in service, or you could get a pair of series rims for the inspection to save an argument.