They look the same as mine which I believe are Harken
, although for the life of me I cannot seem to find them online to send you a link. They could also be this:
Short Batten Car for Z-Spar RCB Track: Z-3485AT:
Batten Car designed for use with Masts using Z-Spar Full Batten Mast
Track that is 24.7mm (<1") wide. Car incorporates fully articulating toggle with 10mm threaded stud (22mm long) for batten attachment. Car rides on Torlon Ball Bearings to provide high strength and low friction at a minimum weight. Extruded Aluminum
Car has fully machined races, requiring no end caps. Car is 85mm (3 3/8") long
x 61mm (2 3/8") wide. Short Batten Car uses forty-four (44) Torlon ball bearings....which you will find here;
Z-Spar Batten Cars
If you can't find them, PM me and I'll look at the spares I have to give you a part number.
They come with a 6" section of track. You should have a small removable piece of track insert just above the gooseneck. Lift
all the other slides up, remove the insert, replace with new insert and slide new battcar up to join the others. Be careful adding the extra slide as all of the balls will come flying out if you don't keep them contained.