Exhaust bolts (boring question)

I’m replacing the bolts that hold the cat section to the manifold as they looked a little rusty and I don’t want them to be properly rusty later (the ones with springs on). They do seem a little special though so are they lotus only which will take an age, be the wrong part and cost a bomb or are they available elsewhere?

They are special toyota bolts.

I got some from the local toyota dealership for a few quid (and they were in stock).

Chris