Further to Terry's comments,
I've re-timbered a couple of original decks, and found that if you chamfer the corners of the timbers, they fit into the deck with a bit of persuasion. Cutting them a little bit shorter helps too, and doesn't affect the bearing capacity!
Drilling down through the timbers is by guess and by God, but if you hold your mouth right, you'll find the hole in the chassis bracket. Using a smaller drill bit to drill a pilot hole can help too.
The old timbers have just had coach bolts with a split washer and nut. We have used a pair of nuts for security, but its easy to see most of the nuts from outside to ensure they are tight.
The radio shack, with its timbered body apparently had over-long bolts with springs under the washers. The GS body is able to flex with the chassis, so plain bolts are fine.
cheers
Rob
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