Hi Jacktar,
Just joined the site but have asked exactly the same question. Some replies have led me to Norman Hyde (they have a site). Also try these fellas,
http://www.sprintmanufacturing.co.uk/
They both have aftermarket pipes to fit Legends but they would be Thunderbird pipes. Triumph UK have no more stock of Legend pipes. Reading through other peoples comments, drilling is an alternative but isn't as effective as the a/m pipes. However, ther's a debate that adding the pipes could invalidate your insurance as they are not legal for the road. Others say that as they are Triumph accessories then it's not a problem.
It's confusing the hell out of me!!
Good luck,
Dringy :-g