http://www.mediamax.com/twangg/Hosted/FN%20Mauser%20mag...rig%20top%20view.jpg
http://www.mediamax.com/twangg/Hosted/FN%20Mauser%20mag...ig%20side%20view.jpg

Please advise what parts are needed and how to restore this FN Mauser mag/trigger guard assembly to full working order? Are the necessary parts available and if so where? I plan to have a 7x57 barrel installed on the action.

Looks like you need a floorplate. I am not sure what direction you are going or what look you are wanting but you can get Mark X hinged for $100 or so on Ebay. This would be complete trigger guard with hinged floorplate.

floorplate needed, as ElCaballero says above, and spring and follower.

it looks like the floorplate release button is in place, if not I have some spares, and-

I have some decent floorplates, I'll give you one if you want to pay postage. PM me.

here's Mauser parts on eBay:
EBAY


oops- I see you're in Canada; can I send a gun part there?

I believe commercial FN floorplates, followers and springs are essentially the same as on most military Mausers, $5-$10 items at gun shows or ebay, just add a little polishing.