Had to do this conversion recently. Had a failure of one of the original coil packs (single bolt) that fit directly on the spark plug. As a result I now have a slightly smoother idle and runup.
Bosch 716 coils x 4
10mm x 300mm plug leads x 4
This is a very easy conversion and is quite common on these engines if running higher boost as the stock coil packs have been known to breakdown.