Or have a your stock double pass ic endcaps removed and have new endcaps made so it's a single pass, seen that done before.
There is a site floating around that makes them specific for the type44 cars, been talked about here before alot. Do a search on the archive forum.

(EDIT), kinda resurfaced on MG, kinda old sale post, but never hurts to get in touch with the guy.<ul><li><a href="http://www.motorgeek.com/phpBB2/viewtopic.php?t=8190#100156">possible lead on ic</a></li></ul>