916-28900-157: 157 Tooth Version. This starter ring is used with small bellhousing. The torque converter stds should measure 10 1/2" center to center.
916-28900-164: 164 Tooth Version. This starter ring is used with big bellhousing. The torque converter stds should measure 11 1/2" center to center.
Use 7/16" Chevy flexplate bolts 101-2002902.