Well as most of you might know the gasket between the cat an exhaust front pipe is a big O-ring that sits in a rebate made for it, but when you buy an after market exhaust it does not have this so you will need a gasket that toyota do not do... Well i went to a local motor factor parts place (kevin-cooper's) with a scetch of the end of the pipe and matched a gasket to it... The bolt holes are pretty spot on maybe a little adjustment but nothink really... They said if you go into most place's an give the code from this they can supplie the gasket... This gasket was a massive £1.14p... yer i know broke the bank... Hope this is of some help to you... I know dan507 has found a part number to an I'ts a "walker" Part No. 80085 So ya have two to pick from now so if they an't got one try the other....