Ronstan Series 26 Black Track (over 6ft) HH Work Google Sheave diameter: 2 11/64" (55

Sheave diameter: 2 11/64" (55 mm)

The Seitech spread is wider and therefore you need the appropriate axle tube

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Spinlock Aft Organizer 3 x 20mm Sheave (2 Rope) w/ Min Sheave Spacing

Ronstan Series 26 Black Track (over 6ft) HH Work Google Sheave diameter: 2 11/64" (55Product Description Ronstan Series 26 Black Track (over 6ft) Features Length 78 5 8 in. Width 1 1 16 in. Weight 42. 3 oz. Product Information Standard low profile track has stop holes to accept cars with plunger stops. Applications Mainsheet systems on boats to 12m (40ft) Genoa sheet systems on boats to 13m (43ft) Self tacking jib sheet systems on boats to 10m (33ft) Materials Alloy