Gerry I - yes that small somewhat diamond shaped cover below the air cleaner/carb on a Kohler K, is the area where "some" applications mount a fuel pump. (Maybe JD or Wheelhorse, etc).
L. Rehm - please don't give up on us. We won't be able to stand the suspense until winter!!! I had never realized what you have discovered. I've only restored 2 or 3 1x2/3 units, but I'm thinking at least one I did may have had an extra hole in the frame where later units have the hitch pin. BEFORE you go to options here (1 is drill holes in the frame where the hitch pin would be, or 2, weld extensions on the QA slot for the hitch pin) we need MORE INFO. Someone on here must have done this mounting before.
Also, I went back and checked my parts manual and the Adapter Package indicates it's to use the "A" thrower on tractors Serial no. 65458 to 400,000. There are only 4 parts in the package and none to account for this issue, so we need the serial number for your tractor.
(Rehm - under edit, lets just go with confused. Otherwise I may look stupid as well, but I am recovering from about 12 PBRs).
Hydro Harry
Old Cubs Never Die (and hardly ever get stumped)