Spacers Maybe Also For Galvanic Isolation?
I'm currently at 6700 ft, spending my week skiing near Lake Tahoe and enjoying four+ feet of new snow courtesy of a major Sierra snow storm coming down from the Gulf of Alaska. I expect that you guys from the upper Midwest won't be impressed, but I've had to dig my car out three times in three days. Pictures of the before/after third dig-out attached.
Instead of the doing the apres ski scene, I'm monitoring the Cherubini forum. Hey, the sailboat is only 6700 vertical feet away so nerver far from my attention.
On my 1980 H36, I wish that Hunter had used the spacers. I didn't know that this was a feature. Instead, the SS stanchion bases were mounted directly on the anodized surface of the factory new toe rail. This probably worked OK for a while until the anodized toe rail surface corroded through. Then the familiar SS vs. Aluminum galvanic reaction took hold. Literally, where the stanchions are mounted, only half the thickness of the toe rail remained when I bought my boat. For repair I have filled the damaged area with thickened West Systems epoxy and I also put down a few layers of vinyl electrical tape to assure there will be no more galvanic reaction.
Anyway, maybe this why Hunter added the plastic spacers? My take is that anything UV and salt water resistant should work. If you are looking for suitable replacement material, what comes to mind is go to the roof drainage down-spout section of your local hardware store. You are sure to find some PVC fittings that have flat segments large enough. Buy a few and just cut to size. These fittings are designed to last decades in the sun for your house. Should be OK to last on a boat for many years as well.