Vinyl top on a squarebody?

[natedogg]

Purchased this 84 C10 recently and it has a vinyl top. I have never seen this on a square. This truck sat in a field for 10 years when I found it and the top has seen better days. Looks like it was put on when the truck was new and looked nice at one time. Somone did a really nice job by tucking the vinyl in behind the drip rails, windshield rubber, back glass rubber and cab trim. On a side note, I already have the truck running, driving and stopping well.