The intarwebz does not agree with you Mike...
Even if the SVo piece is the same as the Lincoln (which it's not, it's modified specifically for the SVO), the ball joint is still SOL.
Maximum Motorsports
"New stock replacement ball joints for the stock control arms of 1984-1986 SVO Mustangs are no longer available. This SVO Spindle Adapter allows the installation of tubular MM Front Control Arms on the original SVO Mustang K-member. This allows retention of the original SVO spindles and brakes."
SVP
"The original ball joints in the SVO Mustang are not replaceable and the torn original rubber boots allow dirt in which is what destroys the ball joints."
Everybody knows that Fords are parts-bin mish-mashers, but the SVO and 87-88 TC both were chock full of bespoke parts that would never be used again. Both suffer from short production runs and very small quantities.