Kosch is still in business, and still making sickle mowers, along with other equipment.http://koschco.com/
Maybe a decade ago I asked about parts for their early mid-mount mowers and they said parts were still available. A complete parts catalog at the time was only a few bucks.
Parts for the Kosch "Steering Aid" are not available.
AG This post was edited by AG in IN at 06:15:54 06/22/13.