So....all this has ..what to say ...about a roughing iron for a No. 4 sized plane....hmmmm
Maybe just get a No. 40 or No.40-1/2? Or..just let the Jack plane do it's job....
History lesson ..noted. Needed? maybe not....
yes, any 2" wide iron will fit into about any #4 sized plane.....simple answer....nothing more.
There IS a chap working for the Plimouth Plantation...you 2 could talk to....Peter Follansbee....ever hear tell of the guy...