The Dor-o-matic 990 Panic Device has been replaced by the 1990 Dor-o-matic Panic Device.  About 15 years ago, when Ingersoll Rand purchased Dor-o-matic they discontinued the 990.  They used to have the Dor-o-matic 990 and the 1990, were the 990 was made with cast bronze and stainless steel housings and crossbars and the 1990 has cast aluminum housings and crossbars.  These two exit devices are interchangeable.  The internal parts are the same, and you can easily convert the surface hardware to the 1990 hardware.  We stock the complete Dor-o-matic Panic Devices, and all the replacement parts needed to fix your existing Dor-o-matic 990.  Visit our web site or call our Panic Device Expert!