I picked it up many years ago and do not remember the year of the car, just that I only really looked at A-Bodies back then. The part number looks mid-70's but I can't find anything online or in any parts books.
I wanna say $30 USD. A rough check on Canada Post is about the same for shipping from Calgary, Canada but could be more depending on the final size and weight of the box with packing material.
Is this for sure the cover you're looking for?
