Our 150H was originally from Minnesota. It came with (I guess) a home made winter baffle kit. It is two separate pieces of aluminum with the appropriate opening, etc. It screws to the front of the cowling. You can see the small holes in the top cowling in the attached picture (ignore the chipped paint!). I don't have the baffles here, but they have been laying in our hangar for going on 14 years. PM me if you want to pursue this further.
