Tony,
My Cobra is a DRB 2000 with EFI Windsor. Just enough room for the Z9 filter without the spacer, but the Z49A filter is a couple of inches so just fits neatly with the spacer.
I was concerned about the location of the sensor as my
oil temp showed up to 120C in traffic, but it may be that the sensor itself is too close to the spacer metal (which get's pretty hot) i.e. the sensor needs to be longer.
Anyway, the car runs okay and I change my
oil every 3,000 kms so should never be too cooked (so to speak)