got a pic of your truck? I'd love to see it. I had a white 77 sport fleetside. I wasn't on the net when I had it so I never did find any stripes for mine. I do see them from time to time on ebay though. A few months ago a pair of the chevy sport script decals went for $30 or so.
No stripes, but It had the right wheels and rollbar. My dad bought it new, he peeled the stripes off around 87 or 88 because someone keyed it and the stripes weren't available anymore. He did say one time he replaced the lower front bed stripe under the gas filler and that little decal was around $45 back in the early 80's.