Kubota B2710, IH TD6-62 dozer with Drott 4n1 bucket loader
The tines sold by Agri-Supply (part # 33913 @ $2.99 each) are 1" wide and they should be spaced 2" on center. That's how I spaced mine and I based it on looking at manufactured landscape rakes. The Woods rake I had in for repair recently used this spacing.
BTW, buy the 2 hole tines. They are easier to mount and keep from twisting.