Spare rim help

Currently have 35/12.50/18R KM2's on 18in moto metal rims and am having hell trying to find a spare rim for the same tire. Was originally just going to get 5th moto metal rim, but theres no hole underneath the caps for the spare tire winch underneath the bed. Anyone know where such a wheel can be purchased? Been searching online for hours!

 

At this point think im just gonna purchase a 5th moto metal wheel and bore out the center for the spare winch... Anyone feel this will comprimise the structural integrity of the wheel?

 

Why would bore a new wheel? Will a 35 even fit under the bed? Why not put the same diameter tire on on a stock rim. Doesn't matter what size the wheel is as long as tire is same diameter.

 

Yup! My feeling is any diameter close will allow you to crawl home, you just might not want to run in 4 with odd size tires

 

I already have an extra 35'' tire and would like to have a full size spare, especially when wheelin. It should be a tight fit under the truck, but a fit nonetheless. If not then I wont have to take a hole saw the the center and will just mount it in the bed.