Center Caps for Rally wheels

[Tom66C10]

Does anyone have a picture of the back side of a Sombrero center cap?

I have a 66 C10 with Disc brakes. The front hub sticks out too far to use the smaller Disc Brake center caps. So I bought the 1952 larger caps. They are deeper, but also bigger diameter. They hit the face of the wheel before they clip in. I bought these clips to use the Sombrero caps, but hoping to use the larger caps I just got today. I'm wondering if I can just put washers behind the clips? Keep adding washers until the clips snap in place?

Thank you.

Tom Jenkins