OK, through the power of deductive reasoning, I figured if I had all of these collets, there had to be a way to use them, especially after finding the taper with a collet in it. So, I measured the dia. of the tail of the collet and found it to be .50. I then turned a piece of the 5/8" aluminum bar I found to .49 for about 3" in length.
A new findI then stuck it into the tail of the collet and found there is a stop ring for it to rest on. I did a little measuring and cut the bar off so the larger diameter would go up into the opening on the taper
A new findI then measured the hole in the back of the taper and found it to be .52 I turned the aluminum bar to .515 and assembled everything.
A new findEverything fit tight and locked up as expected. Chucked it in the lathe and spun it up. It runs true. Eeehaaa
Now all I have to do is get a steel bar and turn to the same dimensions and I will have saved a chunk of money.