its bronze t track for external slides but stainless will work and it rivets to the boom track and mastMale or female track? Aluminum or SS? What brand is your mast? Is the track attached with fasteners or does it slide into the mast from the end?
thats a different type that one has holes in it for the spring pin on the spin car that locks it in place5/8 track is pretty narrow, I am having trouble finding 6/8 or 7/8 or 1" I want to put a short strip about 3' long verticall on the forwards side of my mast to carry a spinnaker car that can double as a whisker pole car. I'd like the track to adjust the car up and down for the various headsails. I too, am having difficulty aquiring such a narrow track but I'll keep looking.