Not Ranked
Chuck,
Call ERA, ask for Bob or Doug and you will get the right answer.
I suspect the Wilwood kit would fit as the Sierras look like the Wilwood calipers.
However, your pistons may be different sized than mine. Come to think of it, I'm surprised your late chassis [665] came with Sierras as I thought ERA switched to all Wilwood for the brake upgrade. I retrofitted mine as I have a very early chassis and had the GM single-piston calipers.
Anyway the guys can straighten this out.
Keep us informed.
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Chas.
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