Richard, if I remember correctly, they knew it as the 8inch.
The measurements I provided where maximum dimensions.
Mention what it is for them may remember as at one time There was potential for them to supply to the factory.
Thanks for that. The version I quoted they list as 8.25" although their metric conversion is suspect.
Will try for factory version on my new build and use your suggestion/mod as retro-fit if they can't accomodate.