mine were leaking so looked at uprating them, having a mare with one pipe as its a s shape that comes off the charge pipe on the 1.8 20v t, its all 60mm upto the last bend before the s shape pipe but far as I'm aware u need some straight 60mm, 90 degree metal bend which u can get off ebay some straight bits but after that i can't really
help u as I'm not sure if the diesel pipe work is any diff to the petty one, anyway no idea if its any use to you but hope it is
this was one image i found