If you are replacing an original HF72 or HF73 flush mount Helmsman compass with one of the newer HF742 or HF743 Helmsman models...
OR
If you are replacing an original SS-1000 flush mount SuperSport compass with the newer SS-1002 model...
You will need to purchase an H-ABLK or H-AWHT adapter ring.
The adapter compensates for the smaller size of the newer compasses, so they don't fall into the original mounting hole.
Each adapter comes with a mounting gasket and fasteners.
See Related Products, below.
This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm.
www.P65Warnings.ca.gov