Window crank spacers 1968 Barracuda Fastback

[my68barracuda]

Finishing the interior, I have three window crank spacers,
One is thicker than the other two.
See photo.
What is correct for my car, are the front and back different thicknesses?
Or are they all the same and somehow one got mixed in. I know I am missing one set of window crank-spacer, IIRC it is a rear set.

 

[1969383S]

The thinner ones seem correct to me.

 

[QWKSLVR]

I have the thinner ones on my 1969. Bobby