Those are 1955 mounts.
Another difference between the 1954 and 1955 Fleetwin that I’ve seen is that the 1954 powerhead has a blockout for the identifying welch plug, but no plug. The 1955 powerhead has an identifying welch plug that will match the model/serial number on the transom clamp if all is original.
I zoomed in on the picture that you posted, and I see a painted over welch plug. Although tough to see, it looks like the model number may show “7518”. If it is 7518, then the powerhead is a 1955.
If the id plate on the transom clamp shows “7516” then some swapping of parts is most likely.
Regarding decals the two main types are vinyl and waterslide. Both have pros and cons. The vinyl decals are more popular and generally easier to work with but are difficult on compound curves. Once applied, they have more of a 3-dimensional look than original decals. By far the majority of vendors sell vinyl. The 3M decal material is of good quality.
Waterslide decals are a closer match to the originals because that’s what they had back in the day. Once soaked in warm water, they are very delicate and easily torn. It requires a bit more skill to apply them successfully, but they hug the compound curves a bit better. Once applied, they have a flatter appearance more closely matching the originals.
Improvise-Adapt-Overcome
