I replaced the cat converter on my 1991 Previa LE because my original O2 sensor connections were rusty. At 340,000 miles I still had the entire stock exhaust system and loosening the old rusty bolts was a hassle for a home mechanic like me. I wish the screws were included because it was difficult and cheap to find an exact replacement. Like other reviewers, the rear suspension mount was missing and had to be done - a waste of time. It worked fine once, but then unfortunately the front 4-pipe exhaust manifold leaked! Unfortunately I can't find this part at Revain.