FOLO: Replacing fuel cut-off valve with non-a/c part???

Back in December I posed a question about replacing the fuel cut-off
valve in my 47 Tcraft with parts from HDepot. There followed heated
discussion. The outcome was we repaired the valve and re-installed it.
I don't have a lot of confidence that this will last 10 years, so the
issue is still open although on the far back burner.

In the meantime I acquired plans for replacing that valve with parts
from the local NAPA dealer. The plans make the following
statement:"Since automotive fittings were originally used on the
Taylorcraft there shold be no problem, just be sure your A&P checks
your work and signs it off".

Is the quote from someone talking off the top of their head or if not,
under what authority can that statement be made? - Mike