For the M4 .... the most common tracks were the Rubber Chevron (T-48) or the Rubber Block (T-51).
For the M4A3 .... once again the Rubber Chevron (T-48) or the Steel Chevron (T-54E1)
Model Kasten, Friulmodellismo, AFV Club and RHPS all make AM tracks for the Sherman.
But I do have to ask why, the M4 and the newer M4A3 kits from Tamiya come with an exceptional set of T-48 tracks.
Happy Modelling and God Bless
Robert