2 spinnaker pole sliders are for sale. Both fit 1" wide x 1/8" thick track.
The first slider is a stainless steel unit made by Schaefer. The inner diameter of this unit's ring is 1-3/8". This slider is $60 plus shipping.
The second slider is made of heavy anodized black aluminum with a stainless steel ring. The inner diameter of this unit's ring is 1-1/4". This slider is $50 plus shipping.
Both units are located in Corpus Christi, Texas.