Molded tooth chain is the type found on many boat canvas covers. The #10 Slider has the square end tabs. the other widely used slider is a #8 and that one has rounded slider tab ends.
Vislon Zipper Pull Slider #8 Metal Locking - Double Pull
This replacement slider fits 8c YKK zippers
ZipperStop Distributor YKK® -Zipper Repair Kit Solution YKK® #8 Extra Heavy Weight Coil Long Pull Sliders Black Made in USA - 3pcs a Pack …
ZipperStop Distributor YKK® -Zipper Repair Kit
ZipperStop Wholesale - YKK Zipper Repair Kit Solution Vislon #10 Slider/Pull type Plastic - Top Stoppers made in USA in CLAMSHELL BOX W/Hanger (Locking Double Pulls, Black 2 Pulls-top stoppers)
How to Choose the Right Zipper
YKK VISLON #10 Separating Zipper Automatic Lock Short Double Pull Metal Slider 240 Black
10 PACK YKK #5 C 5C Sliders Zipper Pull Tab Metal Large Non-Lock OLIVE DRAB READ $8.75 - PicClick
Zipper Repair Kit
Heavy Duty Zippers #10 - Black — Northwest Tarp & Canvas