in this case OG = original guy with FD's !
do you guys use any spacers at all , front or back ?
i run 3mm spacers. in the front they are used to clear the strut mount. in the rear they are to get the wheel to seat on the hub face. the FD's have the same center bore, but its not as deep as the protege wheels. so when you mount them to the rear hub, the wheel face wont sit flush to the hub face.
3-5mm spacers can be used with stock lug studs. i suspect you could run as much a 15mm with the FD wheels and still fit some tires under the fenders, but you will need longer studs for spacers that thick.
as for tire size, i run 215/45's. 225/45's will fit too. anything wider, and you'll need to do some rolling under the fenders.