Let's see if I remember correctly. LeMans kept the Bosch while other models got the Surprize.
A LM5 I used to work on had it w/I installed a Silent Hecktik (or however it's spelled) rotor up front.
Some models like the Mille came in both ways.
Hell of a surprise w/you see it for the 1st time and think"Yea Surprise will this stuff be junk?"