Are you talking about the 3 piece shroud assembly that has no place for a filter to fit. My answer is K&N. Standard tube type with 62mm hole. Then make up a set of collets (outside dia 61-62mm) for each Velocity stack out of nylon. Remember top make sure they are tapered. Problemo solved.
Neil, I'm getting the tank connectors machined up if they are any good you interested? Cost is not going to be cheap. I searched to country to no avail.
loony, I've trial fitted them to the bike and they fit up a treat, this is with Harris yokes though (wider) + larger diameter Ohlins road and track forks. No problem lock to lock.
jgriff, if you could u2u me with some costs for these - are you talking about a reducer that would allow fitup of the smaller diameter inserts or are these going to be replicas of the original parts ??