The flexi on redfive was blowing so I ordered this replacement flexi off ebay:
https://www.ebay.co.uk/itm/Rover-MGZ....c100167.m2940
However what should have been a couple hours task turned into a day and a half task. Whilst the replacement part is fine on the manifold down pipe end with the 3 bolt joint which fits perfectly, the other end which attaches just ahead of the catalytic converter is completely the wrong size.
On that end the way it's made you have a inner sleeve and outer sleeve which is meant to fit on the inside and outside of the car's exhaust, however the inner sleeve's diameter is too large so won't fit inside the car's exhaust, and the outer sleeve's diameter is too small so it won't fit over the car's exhaust as well.
By the time I realised this I'd already cut off the old flexi, so to fit it had to knock the inner sleeve further into the replacement exhaust part so that it's out of the way and had to heat and bend the outer sleeve out to increase the diameter, and had to spend a lot of time angle grinding the car's exhaust (where the replacement part fits just ahead of the catalytic converter) to reduce the diameter of that pipe so that your replacement part would just about fit.
Luckily after hours of effort I managed to get it to fit properly with a perfect leak free seal.
I asked about on the facebook groups if anyone else had experienced the same issue and received a few responses confirming they'd had the same problem.
I've messaged the seller about this, see if I get any response to say they'll amend it. I'll update on here if they correct it.
So just thought I'd put a heads up on here in case anyone else was going to order one.