I thought i would pop this post on as i had been trying to find the safe place that i put the track road end locking nuts, with no luck.
So a quick post on the forum and i have the info back that the nuts i was looking for were: m14 X 1.5 pitch half nuts.
So after a quick google i tracked down this site: ttps://www.brickwerks.co.uk
and it turns out that a T3 VW has the same ones, and they are only £1.76 each.
Here is the link to them: https://www.brickwerks.co.uk/half-nut-m14-x1-5-bzp.html in case anyone else is looking for an Opel Manta A Series track rod end locking nut.