I suspected as much but was hoping. I now have a Makiflex, but it only has the back for 6x4.5/6x6/6x9 holders. I really would love to shoot 4x5 in it (understanding that there's only 9x9 coverage). I've knocked together a Graflok onto a plate that mounts on the camera and it works (!), but of course the reflex focus is entirely off. I was hoping there was a reasonable solution for getting a 4x5 back onto these things with correct focus that doesn't involve a machine shop.  Thanks for your help!
		
		
	 
Hi OrientPoint,
Congrats on finding a Makiflex.  Is it a Standard or the Auto Makiflex?
The standard Adapter Back was:
97318    2 1/4"x 3 1/4"  "Rail Back"    MX 1/521            $44.50
              for 8 exp Plaubel Makina
              120 roll backs which come in
              12 exposure, 8 exposure and 35mm
  
Other Adapter Backs
97320    2 1/4"x 3 1/4" back               MX 1/525            $44.50
              with spring loaded
              ground glass screen    
97322   2 1/4" x 3 1/4" back              MX 1/526/1          $81.00
             with spring loaded
             ground glass screen
             for double dark slides 
97324   3 1/4" x 3 1/4" back             MX 1/537              $57.00
             for single slides 4x5"
97326   3 1/4" x 3 1/4" back             MX 1/538              $57.00
             for double dark slides
             4"x5" (FIDELITY,
             GRAPHIC, LINHOF,
             POLAROID)
97328   Adapter Back-                    MX 1/539                $67.00
             Accepts following
             holders:
             1) Linhof Rollex
                 2 1/4" x 3 1/4"
             2) Linhof Cine Rollex
                 56mm x 72mm
            3) Linhof Super Rollex
                56mm x 72mm
           4) Graphic Roll Holder
                2 1/4" x 3 1/4"
           5)  Polaroid Sheet Film
                Holder 4x5"
97316  Polaroid Back Adapter       MX 1/531                  $232.00  
            for Makiflex System, with
            viewfinder mask for film pack CB100
           (usuable format 74 x 86mm)
            
             06/67  CATALOG      EHRENREICH PHOTO-OPTICAL INDUSTRIES