it should also tell on the options sticker if its a CST or not...but then again, the glovebox door may have been swapped from another truck...so check the vin from there with the vin on the door jamb plate. also, i think it's been decided that swb = short wheel base, and lwb = long wheel base. the holes in your roof may have been from some sort of antenna, like for a CB or something. CST was dropped from trucks in 1971 in favor of Cheyenne, I do believe, but they kept CST for 71 and 72 on Blazers only (if optioned).
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1969 GMC K2500 
1996 Honda Accord
2007 Kawasaki KLR 650
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