M3 Lee-Gun Barrels ?

Building a Tamiya M3 Lee and need help locating the following-

37 mm gun barrel either in resin or metal.

75mm(short) gun barrel with counter weight either in resin or metal.

Does anyone know how to aquire information on the 193 tank Battalion , the only US unit to use the M3 in combat in the South Pacific(Makin Island, 1943)?

try eduard barrels or Jordio Rubio barrels

Jordi Rubio US M3 75mm gun #TG-17 (long barreled)
Elefant #35.346 75mm gun (shorter barrel, no counterweight)
Jordi Rubio M6 37mm gun #TG-48 (for the turret of course)