click on 'under bed tire'
http://new.photos.yahoo.com/woogeroo/albums The diagram image there is a scan from a LMC parts catalog I believe.
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click on:
1965 chevrolet stepside pickup under the bed spare tire setup (images of my actual truck)
http://picasaweb.google.com/woogeroo --
I have not yet put my spare under my bed, as I have 'previous owner' issues with the current exhaust setup. Once I get the exhaust setup like I want, then I can put my tire under there.
I hope this helps...
-W