Synergy 8086 - Jeep JK Rear Long Travel Upper Shock Mount - Manual (Page 4)

4) Dbl check that the stock shock mount is adequately trimmed so that the new
mount sits flush on the stock mount.
5) Once satisfied, mark the holes to be drilled out to fully bolt on the new mount.
6) Once marked, remove the shock mount and drill the 2 holes on the
crossmember to 5/16” or slightly larger (11/32” is recommended). Drill the
hole on the frame to ½” or slightly larger (17/32” is recommended).
7) After drilling, this is a good time to apply a fresh coat of paint to the stock
shock mount area since the cutting and drilling will have left exposed metal
that will be prone to rusting.