There are several type of wood bushings. One is a round outside diameter and an inner hole of the shaft diameter. These are split so the grease will pemetrate. The type of wood is not as big a problem as you might think. The other kind is a hex outside and a round hole in the middle. You can but those from Linebacher over in NC they are $4 each half. or $16 for the two ends. Just a tip, if the cast iron outer bushing housing is worn egg shaped, weld a 1/4" washer to the face of the housing and it will be as good as new. Hope that works.