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Originally Posted by TheWhiteElephant
Thanks for that info. My '73 longbed K20 also has a wood floor bed and the cross sills are very rusty.
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You're welcome!
I just took a look through some of my old info and found some part numbers you might find helpful. I don't think they're listed in the Mar-K catalog ... I got them when I e-mailed their tech support for more info on the 67-72 cross sill dimensions.
#100707 is the number for the un-drilled 67-72 style cross sills (5 required for a longbed)
#100706 is the number for the un-drilled 67-72 reinforcement strips (2 required) ... these are the "smaller cross sills" that go in the middle where the frame humps up over the axle.
In addition to drilling the holes, I also had to saw a few inches off those 67-72 style cross sills and reinforcements. The 73-80 ones are a bit shorter since the wood floor section is a little narrower than 67-72 due to those wide flange pieces along the bedsides.