Nuts.

...and bolts.

If you walk into your local nut and bolt shack, and tell them,

"Hey Bozo, go ahead and get me stainless socket head bolts in these sizes;
4 55mm M5's
4 20mm M6's
8 30mm M6's
4 35mm M6's
5 50mm M6's
8 M5 nuts.
Make it snappy or I'll call your manager and complain about your anti-professionalism."

Do that, and you'll have all the bolts you need for your E50 rebuild.

Also, this site knows what's up.