The OEM system should fit fine, since it doesn't connect to the fiber. Currently on sale at Potomac for $425. Paul Dick installed it in a 2001 with very explicit documentation which should apply to a 99 as well.
http://home.earthlink.net/~phdwebsite/ves.htm

MB OEM VES by Rosen (photo: MB)
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W163.154, M112.942, 722.662, ZF.970.402
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