I have a new (to me) C&C 37+ and need to replace all 6 sheaves in the boom (inboard and outboard reefing lines and outhaul). All 6 appear to be original (1990). The outhaul was wire and I am replacing it with Dyneema. Each sheave (plastic for the reefing lines and aluminium for the outhaul) is 51 mm od (2 3/8), 13 mm id (1/2) and 16 mm (7/16) wide. The width is the problem, they each have their own channel and I cannot find ones that take a 1/2" pin but are only 7/16" wide.