Thanks for the replies.
I picked up a standard MK2 one today. The shape of the bar differs from the Mk1, and the centre to centre measurement at the threaded ends differs by 10mm, the MK2 slightly shorter.
When I pulled the original bar out tonight, it was under a bit of spring pressure, all the bushes went flying when it popped out. When I inspected it out of the car it looks straight as a dime. Is it possible that the bar flexs' somewhat when the front end is jacked up on stands? Maybe the weight of the suspension on the control arms bends the bar a little? Because I could have sworn it looked bent before I removed it