Dwayne, there is a Griswold waffle iron bulletin in the pdf section on the members side that has a table at the end listing the bases for many waffle iron pattern numbers.
This one shows the 975 low, or 985 high base. In the past many folks have said that the letters don't matter after the pattern number, but with the bases, I think your paddles need a 975D or later. The shank rest is flat starting with the letter D. I believe the earlier shank rest is rounded. Your paddles would fit on it too, but I don't think that's what was supposed to be with it, if your shank has a flat on it.
Tom