yo!
i havent got a side by side comparison - but the original G40 outer cv joint went into the mk1 golf hub and had about 4-5mm of difference!!! it would spin round in the hub no problem without any of the teeth touching! so the mk1 golf gti hub is bigger on the spline dimension.
i worked out the height by lowering the car on the deck with no arms connected and set it how high i was going to run it - then marked it on the strut. - the ackerman angle i then copied by using the same angle you have on the standard shocks - and this works perfect:-) guy (mclovin on clubpolo) fooked this part up when he copied me and had the wrong angle so it steered like a pi$$ed up shopping trolley and had to come round mine to put it right.
there are 2 types of hub on the mk1 so make sure you get the "GTI" hubs as the lower spec ones have a different ball joints and wont fit!
i no longer have these as coilovers - there now air ride
il try and answer any questions as soon as i get time
KiZ