If you get the shortening of the housing slightly wrong then gear selection isn't easy!
not easy to see in the photo - but I had to push slightly down on the gear lever to select first and second - which leaves you open to the possibility of reverse at the wrong time.
The selector shaft gearstick connector needed to be rotated a small amount clockwise and be re-secured to fix the issue.
The steering arm on the drivers side would make contact with the oil cooler/filter housing.
After a while it was realised that the series 3 has an adjustable steering end-stop on the lower wish bone.
A tweak with the 9/16" socket and the steering was slightly restricted stopping the steering arm from making contact with the oil cooler.