Will the new Von Duprin 33A/35A center case work on old 33/35 series exit devices?

The new 33A/35A center case will not work with the old 33/35 series exit devices.

It is never intended to use parts to convert a device from one Series to another Series as this would void the UL listing (panic or fire) of the device.
The difference between the older 33/35 Series made before 2003 and the newer 33A/35A Series made after 2003 was significant enough to warrant the change in the Series name.

The newer 33A/35A Series Devices were designed to be able to replace an older 33/35 Series Device with a minimal amount of modification to the door.

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