His Giant Beat rides were a little heavier than a 24" GB Multi, but not as heavy as a 24" 2002 Ride, which he used later on. .
That sounds like the AVH Big Ride might get you closer than the current Giant Beat. The Sabian APX 24" was in the 3300 gram range, if you could find one now...
'72 ???That can't be a 2002 though. They didn't hit the market until 1972. Zepp II was recorded over several months during their early US tours (first or second).
Depending on exactly when the session was tracked, the ride on that song will be either a Zildjian A (he used these on the first record and for a time on the first tour), but is also very likely to be a Paiste Giant Beat as his Ludwig and Paiste endorsement deals came into play around that time.
He didn't start using 2002's until the Houses Of The Holy sessions.
I think if you want that popular Bonham Ride sound, particularly on Stairway, Since I've Been Loving You, No Quarter, etc, get the 24" Paiste Giant Beat Ride, rather than a Paiste 2002.
The Big Ride is the same weight as the GB Multi. The Big Ride is just a GB Multi with the 2002 lathing and hammering so it would match the rest of AVH's 2002's, as per his request. The GB Ride is about 400g heavier.
The AVH 2002 Big Ride is not the same as a 24" Giant Beat.
I have both, and the Big Ride has the 2002 characteristics the GB doesn't, and also a different bell.
The lathing and hammering are also different.
The AVH ride is also brighter, by more than a little bit, and the stick sound is more clear.
One thing they do have in common, is the mid range tone after the initial strike when crashed.