Congratulations! Nice Christmas present.
I am not sure how often Baldor has changed those parts.
If the answer is "never", I think you simply need some "Guard Covers" the non-exhaust parts number is: G7FH3801SP (fits right and left) , $42 each cast iron. If you need them with exhaust ports:
G7FH1803A01SP-(RH) and G7FH1801A01SP-(LH) $50 each, again cast iron.
The left hand Arbor Nut is PN: XY6311A62SP. Right hand PN: XY6311A12SP. Both are 5/8 11 (one might have been stolen to use on an angle grinder?)
Baldor has a great support site (
http://www.baldor.com/support/product_manuals.asp) with manuals and illustrated parts lists online. It can be hard to navigate due to the sheer volume of information out there.
These PNs are for a 7" 1/3hp Grinder.