The only one your get chap is a Tony Law manifold there about £400
Thats the manifold
http://www.tonylawexhausts.co.uk/2410/frames.php
This wont be a straight swap tho.. The manifold will need work like Boss welded in for the Lamdas and a flange for connecting it to the std system..
Anyway give them a ring..
This was fitted to the RS2000 Maxi cars
And is the only after market manifold available