Well when I fitted an ie lump to my 94 frame, it was like you say a straight forward matter of opening out the holes, no threads in the frame. However I did have to slim down sockets to fit the nuts inside the tubular bosses. One other mod that you may well need to do is to the small frame cross member that's positioned just over the top of the rear cylinder inlet manifold. On the early ie's (at least) Ducati put in a small indented flat because there wasn't quite enough clearance. Pity you've already had the frame painted. Hope it all goes well.
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Bitza
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