it's too late now that you've purchased hinges, but the key to running a 35 on the stock carrier is the wheel center needs to sit flush against the carrier mount and you need to use rubber isolators.
If your wheel does not have the backspace to make flush contact with the mount, install a spacer.
I notice someone mentioned PVC with end caps but that won't work, you need something that gives so it'll squish a little to keep some tension on the tire and absorb any movement.
I ran my 35 on the stock carrier for 5 years (went 37's) , wheeled it and it held up just fine.
I did run an extension in the hitch to eliminate dropping on the spare when coming off ledges. :thumb: