Does anyone know what sized bolts these cats take? In the perfect storm, I'm trying to replace this part this weekend, my Honda dealer is closed (parts), and I've called numerous auto parts stores with no luck. I have everything I need but the bolt size. I can't tell from the old bolts as they were so covered in rust and gunk build up.

Thanks for any help you are able to provide.

Best I can see from majestic honda is that it is a 10mm, the length and pitch is not listed......but if you getting a new bolt and nut pitch won't really matter. Length, well you are going to have to eyeball that one....sorry.

Hey Poorman, thanks for that. I called my local Honda dealer and all they could tell me was that the cost was $48 plus tax and shipping. They said something about a spring on the bolt but I am not paying over $50 for some bolts on such an old car. I will go to the auto parts store and get some 10mm bolts and see what length will work.

Thanks again and have a Merry Christmas.

Oh, I thought we were behind the cat....the spring ones are before the cat?
This is a bit of an eye chart, I was going for #4 and #46...the size for #46 is listed, the is where I got the 10mm thread size....