B;
Okay, I see what you mean "provisions for".
Sure; the threaded holes were there (pluged) but that type of filter wasn't used in California on trucks, after the 1954 model year.
Why change the molds/castings??
I guess one could have been installed at a Dealer as an 'extra', or whatever. They never worked (by-pass) and that's they were discontinued on commercial vehicles. It was a waste of time and money for everyone.
The "remote" (full flow) was good in theory, but to dangerous in practice and it was discontinued also, in favor of the (right side) spin on which was/is almost 'foolproof'.
