No, there are several. Mostly for cast iron, but even the aluminum have a few different ones.
Anyway, the 1967 & 1968 302 3917610 guard isn't listed in the P&A, but the 3932472 is (1969 302), and that one uses the
3758369 GUARD. I would assume the 3917610 uses the same guard, but again, it's not listed so I can't say for sure. Maybe Jerry can verify this since he probably has a million of these manifolds stashed in his office!
Ed