The saloon part has a vertical mounting whilst the TR part has a horizontal mounting. They are otherwise the same. If your car has been fitted with a saloon overdrive, it is likely that the rear mounting will be a home made affair which could give rise to Noise, Vibration and Harshness (NVH). This part will allow the correct rear mounting to be used thus restoring the integrity of the installation.
This part is exchange. A small deposit will be applied until a serviceable saloon part is returned.
Note: The speedometer drive exits this casing horizontally where as the standard TR rear casing has the speedometer exit pointing downwards.
For a car with an angle drive this is no problem, and for a rally car where it is intended that the speedometer cable should run inside the car, it is a positive bonus!