Re: Motor mount bolts
I've found every fastener I've ever needed at my local Ace Hardware. As for threaded rod; why are you using it? Replace the studs and nuts with Allen head cap screws. Ace carries them in the sizes you'll need to replace your motor mount fasteners. Make sure your engine is tight against the frame. No rubber, not resilient material at all. Use lock washers, tighten the bolts enough to flatten the washers then just a little more. You should not have any problems with broken fasteners if you follow this advice.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"