Thanks, that's all I need. I have some M stickers I can get the rest of the specs from by using your measurements for ratio. Just wanted to know what size these were to base mine off of, thanks again.
I used 'Wurth Timeserts' inthe following size, outer thread = M7, Inner thread M6 and 12mm in length/depth into the crown. They are used for cylinder head repairs and are better than Helicoil even.