The Fleetwood Supreme's came with the Persons Streamline (teardrop) type pedals.
The trussrods tangs on the fork suggest, 1937.
The 38 fork had a slightly different profile.
The chainguard looks like it might have come off a twin flex. The Fleetwood Supreme had a slightly different profile as well.
Still a very hard piece to find, so you're lucky to have one at all.
The tanks and racks, are a little scarce, but they do pop up from time to time, so do not despair, you should be able to complete that little gem in no time.
Congrats, on the nice find.
The Firestone Fleetwood Supreme is definitely one of my all time favorite bikes.