Brataccus,
Generally, but not all, Sea Hawk part numbers are of the form of a letter,(A,B,C etc) and 6 digits possibly followed by a “slash number” (/1, /2, /3 etc). See attached.
Now back on line, but having looked through my B-25H and B-25J manuals (Erection & Maintenance Instructions) I can see no pictures or text that will assist with your query. Sorry about that, and for the delay.
Does anyone have the flying clothing schedule that should be in the annex to this chapter, or the appropriate “Aircrew List”, as its called these days, that would be in chapter 2, please?
Page 14 still to come. They don’t really answer your queries though. I reckon the RN and German seats were virtually the same but both types were probably modified in service to remove the footrests.