J-35 Spinnaker track slider

This fits the J-35 (and probably a thousand other boat) spinnaker car sliders. I think it's Harken, but that's a guess.  The plastic slides give a “friction-less” fit so the car moves easily.  Note, this car is 5" top to bottom, if that helps identify it.

The OnShape model is here:

https://cad.onshape.com/documents/02a99d4da71aad93df5e04de/w/3f463c785c3d233c2062d8d5/e/c3553bb799cfdbbb24bd2a5d?renderMode=0&uiState=68ed749413969a7d64323eadhttps://cad.onshape.com/documents/02a99d4da71aad93df5e04de/w/3f463c785c3d233c2062d8d5/e/c3553bb799cfdbbb24bd2a5d?renderMode=0&uiState=68ed749413969a7d64323ead