Sierra Box Number 18-2104 Heavy Duty U-Joint.  Label Number (Mercruiser  75832A2) 

U-Joint in the box might actually be 18-2174 (Sierra) / 75832T 1, 75832A3 (Merc) / 3850812 (OMC Volvo) ??? 

Rockwell numbers on U-Joint = KC1722D, CPL15N, 15N-F

Possible Fit For:
Mercruiser ALPHA I Units S/N B418819 & above. Also fits ALPHA I SS & Bravo
OMC Cobra Drives (1990 & above)
Volvo Penta

Includes Clips and Straight Fitting, 

If you need more info about model / serial number fit see "marineengine.com" or contact a local dealer.
View the photos and make sure this U-Joint is what you need prior to purchase.

ALL SALES ARE FINAL - NO RETURNS