Dan, You will find some dimensions for the edge groves in the tech tips. All of the bed strips that I have seen are the same so dimensions from a 47-49 should work. Be aware that the width of the 46 bed boards was unique to that year. The 41s and 47s are different.
If you need some more info let me know. I've got a write up I did some time ago on the bed I built for my 46.
George
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