Can the mount be a 3mm peice of steel with a hole for the bolt and a locking nut or do i have to use threaded mounts?

IMHO you need (for your own peace of mind as well as aSVA/IVA) to use a welded in threaded tube. The examiner will probably also want to check that the thread runs right through the fixing.

This is an MK lower harness mount for reference...


MK Indy harness fixing point

[Edited on 13/2/09 by nick205]

Ok. Where can i get them from?

linky

tip - screw an old bolt in before welding on the nut to save the thread from being damaged by the weld splatter as the thread is very fine and easily damaged but difficult to repair




[Edited on 13/2/09 by Mr Whippy]

Mine was a piece of plate with a hooe through them puka eyelet with puka nut with spreader plate

SPREADER

EYELET

Past no problem.
Steve