To assist you in ordering please find below a set of instructions for measuring. The following dimensions will be required to provide the correct part number for both with and without a carrier
A. Shaft Diameter
B. What the Stern Tube Outside Diameter (OD of your Stern Tube)
C. Minimum Distance required from the End of the Stern Tube to the Coupler (See Imperial/Metric Sizes Chart)
D. Overall Height of the SureSeal Housing
E. Distance from the End of the Stern Tube to Where the Lip Seal will ride on the shaft
Without a Carrier With a Carrier