Dimensions of early fireboxes 13 bar vs later

[Reggie G]

So Are the 13 bar fireboxes deeper than the next generation with fewer bars?

I am thinking seriously if I can find a suitable donor about cutting a hole in the side and mounting my pellet pro hopper to one.

I need a hole 4.5" tall by 5.5" wide

I know sac religious and crazy but who cares