(FWIW, when I'm saying 'aerospace' I'm using it to jointly refer to "space" and "aeronautics," just in case I gave the impression I was only talking about space

(FWIW, when I'm saying 'aerospace' I'm using it to jointly refer to "space" and "aeronautics," just in case I gave the impression I was only talking about spaceflight.) Those are technical specs, not quality specs. The quality specs would deal with things like machining tolerances, manufacturer traceability, etc. Point being, if Pratt & Whitney took a seal design from another aircraft to apply to the F-35, it's not like they aren't already tracking the tolerances, material compatibility, etc. When I worked in aerospace, it was very rare that we went to the machine shop to ask for them to make a bespoke component.