Depends what the heck they mean by "ancilliaries manufacturer". In Europe it would probably be Bosch followed by Siemens and Continental Teves (not necessarily in that order). Visteon (Ford) is also reasonably big, and the empeg guys did a project or two for them way back before the days of Sonic|Blue. No idea how big American outfits like Delphi (GM) are in comparison though. Is also pretty big.
(list 6284, Mk1 S/N 00299 4GB blue [for sale]. Mk2 S/N 080000094 26GB blue)
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(list 6284, Mk1 S/N 00299 4GB blue [sold]. Mk2 S/N 080000094 20GB blue)