33/34 body fixing query.

[Graham Freeman]

I have a Roy Nacewicz 33/34 body mounting kit.
The fastenings supplied for the wheelhouse to frame kickup (2 per side) do not appear to be correct.
Supplied are 5/16" - 7/8" carriage bolts where the heads are supposed to face outwards.
Looking at original vehicles that I have seen they all have hex bolts with large
1 1/2" washers on the outside which fit into slight recesses.
If the washer system is correct? the finish would be cadmium?

Thanks
Graham