Well, I found NOS shoes on Ebay and I just received them today. They were new in the box and have the correct P/N 7064978 on both the boxes and shoes. However, the shoes that came off my XM1061E1 have 3/8 inch thick lining and the new shoes only have 1/4 inch thick lining. Otherwise they are identical. Looks like I now have a shorter life expectancy on the shoes, but with the low mileage I put on the trailer, not a big deal. The relay valve failed, causing the brake failure and fire. I just received an NOS relay valve today as well. Hopefully, I won't have any issues in the future. I'm still waiting on one more wheel cylinder before I complete the rebuild.