Joe, that's because you're too close to DC.
Out here in the hinterlands, there's still stuff in the yards.
Plus MD has that inventory tax that makes the junkyards crush everything, so no need to go there. The Cap City guys were howling about that 20 years ago. Leon's in Culpeper is yall's best bet. Only junkyard I ever went in that they gave you a map. Without it, I expect you could get good and lost in there.
I bought an NOS pair off the bay last week. Scott's link is the second pair I've seen on there recently. Though why one needs two at the time...
I have 2 64 Starfires so there's a spare for each.
Took the blue one in for inspection around 1988, the last one before I put YOM plates on it, and when they pulled the LF wheel to check brakes, the kid doing the inspection didn't know about indexing the cap to the speedo cable. Ended up dinging the cable to where speedo woudn't work so I made 'em find me a new cable.
Greg, make sure that hasn't happened to yours.