Taz 5 y Motor Repacement

Looking for a replacement motor for Taz5, y axis is basically skipping steps, (making a grinding noise) and motor seemed alot hotter than the others. The model number is SY42STH47-1504A, looked on Luzbot spare parts and they say they are out of stock, looked several other places, but really could not match up the model number. Can anybody recommend a replacement model. Thanks!