Seen quite a few of them them pop up on this site.
If you want to see something crazy, you should see the avalanche and tahoe looking 67-72 that was sold in argentina....
The argentina bed is even cooler than the Mexico bed... it looks just like the mexico bed, except it has the correct/matching fender wells.
See pics here:
http://www.67-72chevytrucks.com/vboa...ight=avalanche