The U-22 (aka the T-34/122), was a proposal from spring 1942 to fit the T-34 tank with a new turret equipped with a U-11 122mm howitzer. Only two crew members could fit inside the turret which was deemed not enough to operate the gun effectively, the project was canceled in favor of the SU-122.
Factory #183 proposal
Factory #8 proposal
Unimodel make 1/72 scale kits of both versions.
Adam Wilder released a 1/35 resin conversion of the #8 version, long out of production tho so good luck finding one.