Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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The part is the metering valve. the style with the big nut on the front was used from '67-69. A, F, & '69 GP with factory disc brakes can use the same metering valve. B series used a slightly different rate metering valve. '70 model metering valves lost the big nut feature, '70 factory disc models also gained a hold off valve on the rear frame crossmember in front of the rear brake hose.
In the late 80's & '90's I pulled the various '67-69 styles in yards as a specialty core. Wholesaled the weathered ones to be rebuilt, & retailed the best. Years ago on eBay, nice used early disc metering valves were up over $125 for many years. Several years ago, Inline Tube brought out a repro of the style with the big nut, then dropped the price on them. Doing anything short of a true Concours restoration, if ones staying with this style of original appearance style front disc set-up, one's better off buying a repro of the early metering valve from Inline for $59.