Hot Rods '52 mercury body mounts

Does anyone out there know how to get the body off the frame so you can replace the rubber grommets between the frame and body? It seems like there's another bolt somewhere else but I can't seem to find it

 

I haven't taken a Merc apart but the usual process is to work your way around the perimeter from underneath then go inside and see if any are screwed down from inside. Make sure the steering box is loose. I ***ume the front sheet metal clip is off too. Sometimes the rust has fused the body and frame so tap around the bolts with a BFH.

 

I've gone inside and pulled everything up but I can't seem to find any thing on the inside

 

On a shoebox there are a couple of round metal plugs that cover two bolts under the front mat area from memory. Prise the plugs out .