You're right - it's that Buckler DD2!
Maybe it only had the holes on one side..
So I've given Otto a point for getting the Buckler name and posting a photo of the right car, and Allemano a point for getting the DD2 model name posting some more photos!
Sorry woodinsight, if I'd had the chance to log on earlier today you might have been able to make some progress with the reply I'd have given, but I'm afraid you've been trumped!
The car is currently in Japan.
Thanks, but Otto actually made the main job.