Which Tracker was fitted to 2001 BMWs? [UK]

Looking at buying an October 2001 E39 which is fitted with "the Tracker which BMW were selling at the time".
Tracker (www.tracker.co.uk) currently do four different variations of
their product - Retrieve, Horizon, Monitor and Echo.
Does anybody know which of these Trackers (if any) BMW were fitting at the time?
--
Philip

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Shouldn't tracker be able to tell you this? AFAIK it could be any...
I bought a brand new 2001 330ci and had tracker fitted, I had 3 different options.
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