Hi Bob
Firstly I think its my turn to compliment you on your restoration of your vehicle I am sure it will turn out to be a very high quality restoration.
Regarding the helper springs, I think this topic has already been covered earlier in this thread.
The springs are fitted as standard on C15's I think, I am not sure of C 15 - A's. My truck is a C15 not C15 - A
Its a different beastie.
The floor plate rests on a plate welded to the underside of cab frame the rear floor plate is then welded underneath to the cab frame.
My 13 cab rear panel frame is bolted through the floor cab frame with one long center bolt going through a spacer into chassis crossmember, the other bolts go through the cab mounting springs, will add some detailed pics when I can.
The rear cab panel frame is bolted directly onto cab floor frame thats the margin you can see in the photo.
Its starting to look familiar now
have started to loosely fit the wiring harness before fitting front.
cab view.
RR.