Has anybody ever herd of constrictor bmx

Constrictor was my Canadian introduction to BMX in 75/76 when the neighbor kid rolled in with his. It was a Sears bike (yellow) with black tuffs. Boy was he drooling the next year when I came home with the Sears full suspension.
If this is the constrictror in question, I'm sure you can source some old sears catalogues online.

That was the name on most of the Sears BMX models sold here in Canada. There were many models over various years. They were much nicer than typical department store bikes.