http://www.strangeengineering.net/catalog/pdf/107.pdf
Wilwoods are black, some are brass but they are plumbed in the line from the master to the front junction block. They are for cars with the master lower than the caliper,
but they are not needed for ERA's.
If you have one, remove the entire line, re-flair a new one from the master to the junction without the valve in place. Bleed as normal.