The ones I got connected just fine to my 1200 planter.

I love Shoup.  I also ordered a monitor caddy for my JD 8410 tractor.  It cost $93, and the same thing at Deere was $165.  In fact, I think the cup holder on the Shoup caddy was made better than the over priced Deere caddy.  I completely rebuilt my JD row head out of the Shoup catalog, too.  The rippled gathering belts were 1/2 the price of Deere's.