To answer TimeforChange's other questions:
Q. From looking at pictures of them, the width of the car is basically nothing. Is that right?
A. The GT is a very small car. The GT is a two-seater. Sitting in one feels sort'a like sitting in an MGB or Spitfire or such with the top up. The Manta and Ascona are similar in size to the 2002, Cortina, 510, etc.
Q. Do they still have the performance that you guys are talking about with 4 bangers?
A. Keep in mind the Showroom Stock class the Mantas and Asconas ran in was an unmodified class that put them up against other 4-bangers, Rabbits, Arrows, Pintos etc. In Europe they ran them, heavily tuned, in rallies. They were very successful. The GT was also rallied.
As an aside, the GT found quite a bit of popularity among US drag racers. You often see them with Big-Block V8 drag motors. (and custom tubular frames, humongous drag slicks, etc)
Q. Do Opels have steel or fiberglass bodies?
A. They are true mass-production vehicles. They are all steel. (although some factory race models may have fiberglass bonnets, boot lids, flares, etc). The GT's body has multiple compound curves and can be very frightening to many of today's less-talented body shop types.
Unfortunately you just missed it TimeforChange, the Opel Club picnic was in Van Nuys just a couple weeks ago. You could have seen a bunch up close.
PC.