1970 E-Body Caliper Bolt Centering Clip, Do I need these?

I purchased a new (rebuilt) set of front calipers for my 70 e-body, and they came with all of the hardware except for the end pin positioning clips (see picture). Do I need these and if so, why didn't they come with the kit?

I would install them

I should add that I don't have them, and the ones in the picture are 80 bucks...

Looks like they are $15 on Rock Auto

If your pins look like these you don't need them.... Pins link click here

The ones that are 80 bucks because they are 69-70 C body, and 70 B & E Body.
They are styled somewhat differently than the ones from 71 on up, till the end, when Chrysler stopped installing them on their cars brakes.
So if you not an anal, correct assembly line type of parts guy, don't buy the 1970's ones, and get the 71 on up ones, or don't use them at all.

The pins that came with my rebuilt calipers look like those in your attachment. So I guess I'm good to go?

Yep...usually the rebuilt calipers come with the newer design pin. Here is a pic to compare to. The newer pins protrude thru the caliper more I believe.

No, you don't need them, they just add friction and heat.

I don't have them on my car and my brakes work perfectly even over 100 MPH

Gus

They also serve to keep the inner bushing from sliding out. Those bushings that don't have the double lip on them.