Quote Originally Posted by HK1837 View Post
It is def early and late. The bigger bearing pumps were introduced late in 1978 or thereabouts, and this pushed the pulley face further out, meaning the pulley is "taller".
Page 79 of your HJ parts manual.
Top right with normal fan looks a whole lot like the round nose one.
Bottom left with clutch fan looks a whole lot like the square edge one to me, note the shape of the pulley itself and the extra line at the base of the snout section showing the different detail.

I'm guessing that part 7435189 is the round edge
Part 2812459 will be the square edge.

Happy to be proven wrong. I'd be interested to know if the part numbers change when the long nose pump came in.

Blockers pulley was a v8 one, not a 6. We measured the diameter.