I need three brass manifold nuts, the ones that bolt the cat to the front pipe on a Z18XE - Vaux are hopeless and could not find them, how stupid?!

Also, I need the front parts of a pair of coupe skirts, the front bits that go under the wing. They are about 4inchs long

Any help would be great, the parts bloke is a bout 90 at my local dealer and knows nothing!