STC4096L was the kit I got. All though I think I actually got it from Craddocks not Paddocks .
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Was well worth it as when I got the front of the engine apart I found that the belt was rubbing on the inside of the front cover and had reduced it's width by about 4mm (compared to the dayco replacement) and filled the cover with rubber dust in the less than 18 months (less than 10,000miles) that I have owned the vehicle, I got the belt changed buy the seller before I bought it. The original crank pulley had no guides for the belt and had allowed it to run forward into the case, the new (cast) pulley has two guides that keep the belt in the correct position.
Pete.