i have a 26" slingerland timp. with a shallow copper bowl. the bowl depth on this drum is only 14.5" from collar to top of the base. i`m trying to find a 29" drum to match it, but all i can find at the moment is slingerland timps with the deeper parabolic bowls. does anybody have info about when slingerland produced these shallow bowl drums or does anybody happen to have a timp laying around that meets this description? thanks, judy