what closers use ultra x

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The maximum recommended door weight for LCN closers is 225 lbs.
LCN does offer a 2810 Senior Swing / 2010 manual closer combo for a pair of doors.  Both units contained within the same Senior Swing header. To order a paired operator with a 2810 on&nb...
No.  As of June 27th, 2018--- the cover screw is now standard in the screw packs for the 4040XP, 4040XPT, 4000T, and 4040SE so ST-3596 is no longer needed.    
closer fluid, fluid, all weather fluid
The Falcon SC81 series closer has a mounting hole pattern of 12" x 3/4".
The LCN 4010SE / 4110 SE series are obsolete, and on longer available. They were replaced by the 4040SE series. The 4010SE / 4110 SE track is replaced with the current 4040SE trac...
A 4040 closer mounted with thru bolts on a 2-3/4" thick door would require 1/4-20 X 3-1/2" machine screws.
The 2030 closer requires a minimum 1-3/8" top rail on the door for the standard track.  For a top rail less than 1-3/8" and as narrow as 1", you could use the l...