LAND ROVER DISTRIBUTOR IGNITION MODULE DISCOVERY RANGE CLASSIC DEFENDER STC1184 LUCAS | Miami British

Well this says it's the same but it doesn't look like the same setup as the distributor in the original post. I guess the one in the OP is a 2 pin.

 

Here's an update. My side by side comparison: 3-pin version (more expensive) is for the 94-95 Discovery. It has a stronger spring and slightly shorter arm than the 2-pin version (cheaper), so the advance curve will be different, and the initial timing position will be different.