Flatbed Mounting

[69 C10 LWB]

I’ve got a question for all the flat bed owners out there. I’m getting close to putting the bed back on my 65 C30. The bed had wood strips between the truck frame and the bed frame. Everything I’ve seen says don’t use wood. The wood looks to be original to the truck or at the very least an old replacement. The wood seems to have served this truck well for a long time. I also understand wood expands and contracts and can cause the bolts to come loose if I don’t keep an eye on it. This truck is not going to be a work truck or even a daily driver just a toy.

My question for everyone is should I just replace the wood with new or fab up some steel spacers since the frame isn’t flat?