I picked up a Santa Fe GP-20 dummy unit #8355 (blue) at a junk store for $10.00. I've seen them around the web and they are supposed to have an electronic horn. I opened her up and found no horn in side. I checked all my books and the web but could not find any parts breakdown for the unit. Does anyone know of a parts breakdown somewhere so I could install the horn into the unit? I have a Santa Fe GP-20 powered unit that it matches the dummy and I would like to restore the unit so the set will be complete. Need help!