existing anchor bolt length


Yes, an additional jamb anchor can be used at the bottom of the frame in lieu of the typical (adjustable or weld-in) base anchor in fire rated frames. This is limited to the anchor designed for...
The following are quantities of EMA anchors (pierce and dimples) based on range of frame height:  Quantity  Nominal Frame Height     2     1'...
No, an adjustable base anchor is not supplied on frames with existing opening anchors. The anchor design for use in existing masonry walls, is a pierce and dimple in the frame soffit for 3/8"...
These dimensions and other general lock case dimensions can be found on template L1.  
There is no EL conversion kit for a 2390, the device will need to be replaced.
The internal rods and latches for the 25-C carried over from the older 18-C device so they can be used interchangeably.
See below for commonly requested dimensions on the MA lock.  Dimensions not found in other literature have a square around them. CL refers to "Centerline".