IDENTIFY MY booster.

From Mopar,I think there are only the two bolt-in types; namely the dual diaphragm and the one you have.
The dual-diaphragm has a linkage multiplier, that raises the booster some 1.5 inches IIRC plus it is physically a smaller diameter. I think it was stock on 340 cars in the 70s.To get the linkage you might try an ad in the wanted section. Your M/C will bolt right to it. The aluminum K/C is only slightly more compact, and since the DD unit raises it anyway, I see no reason to change it. I suppose you could use the offset linkage on your booster, but closing the hood might be a challenge!
I wonder if the van linkage could be adapted, something from the 70s, where they turned the booster sideways. Naw, probably not.....