Sorry, but the only CS Sherman that I am aware of is an M4A3E8. These did NOT reach the ETOUSA until well after Pool had been wounded and crippled. Pool used an M4 named "In the Mood" and after that was knocked out he received an M4A1 with 76mm gun, also named "In the Mood" (Should have been in "In the Mood II"). After that was KO'd in a US air strike he received another M4A1 with 76mm gun )"In The Mood III"). This last Sherman was the one in the few photos of Pool and his crew and the one Poll was riding when he was wounded.
The only available M4A1 76mm Wet Stowage that I am aware of in 1/30th was made by Honour Bound. Wm Britain has done a mediocre version in 1/32nd. There are multiple model kits of that type of Sherman in 1/35th, 1/48th and 1/72nd scales.
Gary B.