I think that most of the ‘66 & ‘71 I have are frosted. I should have some 15 or so lights in boxes now. Few had kinks but with the help of a dear friend who straightened them out I have a few sets thats all in mint condition.
They pop up every now and then online.
Top hole is 470 c/c to floor.
midle hole 460 c/c
Lower hole 450 c/c
Could be advantageous to wait with these holes until you have the steering coloumn to fit as they should be on 9.28in radius from top bracket mount. But all depends on coloumn fit.