"Larry, it really depends whic
"Larry, it really depends which 1991 model you have.
Mercury built all the 120 horse models. Some of them (models 90A and 91C) had Prestolite ignitions on them (Chrysler style).
The models 91D and 92C had Merc's (far superior) Thunderbolt 4 ignitions.
If you have the blue CDI boxes/coils it will be the first one mentioned. The Merc ignitions use the small black coils with the long rectangular black switchbox.
Given what the dealer is saying to you I would suspect you have the Merc ignition. The original stator for those has been discontinued, so it would make sense that the replacement stator would require an adapter to fit your application. If that is the case, unless you can find an original in old stock somewhere, you would require the additional component..."