Here is exactly what Luke sent in response to my inquiry,
"... Hi Dan, the diff cover is pretty much a bolt on. It does not come with a new gasket, but the gaskets can be sourced fairly easily. You will need to use slightly different length bolts. The size is the same M8 as used a lot of places on the saab and commonly available at hardware stores too. I am actually sold out of these covers now. I will start a thread and if we can get 10 people to commit to buy I will do another run.
-Luke"
so um, hey, don't forget that I want one too!
Shadow- I PM'd Luke to find out the weight. So, hang in there.
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