Exhaust replacement - New Nuts/Bolts

[J-Tuner]

Afternoon Chaps

I am swapping out my exhaust next. So i'll be on my back on the driveway wrestling with a 1 piece catback system this weekend i think. Should be interesting.

To avoid any trips out i am anticipating some sheared bolts on the downpipe/cat section. As far as i know they are the only two i need to worry about as the rest is just on hangers. The new system already has another cat bolted to it so not touching that.

Anyone know what size/thread i would need as straight replacements? Was hoping to drop by screwfix and buy a bag to have on hand for when the inevitable happens

Cheers

Steve