Galind - Our '88 H35 has an Aqua Signal Classic Series 25 combination deck-steaming light which was used on all models of that era in the lengths from ? to 39 feet. The "ears" on each side of the fixture have a triangle shape while the ones in your picture, what is left of them, are rectangle shaped so either the previous owner changed the fixture or Hunter used a different model. The P/N of the original part is P/N 254047 but the attached file has a different P/N. If the pictures of the other fixtures look like what you have then this is most likely what the original fixture was.
With regard to the tracks on each side of the front of the mast, they are used for running Isomat cars. This is a really smooth system and the cars had nylon, shall we say, covers, on them where they contacted and rode on the tracks. We have a spinnaker car on ours which is typically what they're used for.