Thanks for your quick reply.
Apologies, I should have said that I'd found Denny's brilliant set of photos, they saved a lot of earlier questions!
That info you provided from the catalog looks to explain it. The shaft is machined for about 5/8" along the shaft measured from the snap ring groove to a diameter of 1 3/8" and then the sleeve is pressed onto that with a 1 1/2" sleeve od for the oil seal to run on. I haven't used the speedisleeve repair type before but assume they'd be a lot thinner than what I've got here so original fitment is making sense (now!).
Back to the workshop then.
