I have the cars out of the catalog for the stainless steel tracks. Put a cheek block on the corner of each front castings and use those to sheet the traveler in/out. Tie a shock cord between the two so they retract on their own. Just tying the traveler sheet to the locking pins seems to hold them up ok, although I don't have alot of time doing it this way. The cars that I bought came with a Ronstat cleat, and fairlead. I think it was about $140 for the pair.