GM Crankshaft Spacer to install an early type 4L60E or 700R4 transmission on a LS1 type motor. Six longer flywheel bolts included. The LS1 flywheel is reused. The flywheel goes on first then the spacer. The torque converter bolt holes in your flywheel must be elongated to fit your non-LS1 torque converter bolt circle. Any questions about this spacer / adapter call Performance Automotive and Transmission Center toll free at 1-888-8771008.