So I lost the bolt that goes between the stock header and to the downpipe that leads to the cat's. The stud is just hanging there. Suprisingly my micky mouse bolt and nut on the other end are just fine ( I bought a exhaust nut and bolt that fit with very minor play and slid it through and bolted it)
Does any one know what the Bolt and Nut are ? I think i have a 84' 12 A exhaust system . It has two cats . All I can find are exhaust header studs ( to the engine) .

 

The ones I've seen is the housing studs .....I think you can use any nut and bolt that fits for the other exhaust parts ...

 

Yeah but they have some play.