WIGGY50

Hi, I have the VIN plate decoder article for an RS1600i and S1 RST, but have viewed a RS16i with a RST engine and the VIN plate codes have been revised, but does anyone know anything about the following:

Engine code = LU (whereas RS16i=L7 & RST=LH)
Transmission = W (looks ok as RST=W & RS16i=H)
Axle ratio = 4 (which is 3.82.1, whereas RST is 2=3.59 & RS16i is 4=3.84.1)
Trim = TC (which is correct for RS16i, whereas RST=HC)
Type = SW (whereas RS16i=ABA & RST=ABET)

I'm wondering whether these codes are official to reflect the modification?

Any help appreciated.

CheeRS

RS1600ireg

The chassis number in the floor is the important one where is it......, front or rear floorpan drivers side & what does it say?