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Windsor pulley kits do vary by their combination of water pump and balancer.
The 2 most common configurations, and the way we list our kits, are 3 bolt balancer with RH inlet water pump (early 65-69 Windsor) and 4 bolt balancer with LH inlet pump (late 69-on Windsor) - both kits are different to the early "short pump" 289 HP engines and some other small run factory setups.

Most aftermarket balancers retain the length of the later 4 bolt balancer and can be fitted with both 3 and 4 bolt patterns
Late model EFI motors with reverse rotation water pumps require will not accept standard rotation "early" or "late" pulley kits or bracket kits