Originally Posted by Bunger

Man1 - the upper mounts are solid rubber. They aren't going to go bad for a very long time. The lower isolators are a thin walled rubber donut with a steel disc bonded to it. The rubber is usually fine, it's the steel part that rusts and detaches from the rubber.

eleewhm - All of the bolts are the same length, should be no need to trash the old bolt either, they are galvanized grade 10.5 and should be fine once you get them out. They are Flange Bolts and have a special rounded tip that helps to line everything up as you put it back in.

If you really want to get new bolts, they are about 5" long (whatever the metric equiv. is) and need to be 10.5 grade (grade 8 might be OK). But be prepared to pay close to $10 per bolt.

Your choice but I would reuse the old ones.