Pair of Unknown Aluminum Blocks, Sensor Housings? Commercial Door Hardware?

Description

3269ZC7C.50
New Pairs of Unknown Aluminum Blocks, or Sensor Housings? or Commercial Door Hardware? or Something Else, Part Number and Purpose Unknown.  Each bid quantity is for a Box of Two (2) Aluminum Pieces, Four (4) Oval Head Screws, Four (4) Nylon Screw Anchors, and One (1) Allen Wrench.  You may bid / buy any number of lots, up to the total quantity available above.
These were purchased at a salvage freight sale last year, and they were brand new in the original factory boxes.  We have no idea what they are, but if anyone knows, we will be glad to update the listings.  Looks like something fits into the rectangular passage, and is then secured with an Allen head set screw.  There could be an occasional scratch, as the screws had been put into the boxes in a rather haphazard manner.
At the time of this writing, we have two other listings for similar parts, which are probably a different material, as the weight differs significantly.
According to the calipers
:
Footprint / Base:  1.938" x 1.742" (49.22 MM x 22.26 MM)
Height:  1.714" / 43.54 MM
Rectangular slot size (at top):  1.064" x .213" (27.02 MM x 5.40 MM)
Rectangular slot size (at bottom):  1.114" x .428" (28.30 MM x 10.88 MM)
Screw holes:  .226" / 5.74 MM diameter, spaced 1.432" / 36.37 MM OC (on centers)