My endeavour just became distinctly more British and less Japanese today. I am on my way home from Germany and happened to find myself with an overnight layover in England.

Not being one to let an opportunity slip by, I hired a car, pointed it toward the Midlands, stopped by Canley Classics and picked up a pair of trunnionless Triumph vertical links to take the place of the Miata's uprights. Thanks to Clare and Phil for being so helpful! Another 20 miles and I arrived to Stafford Vehicle Components for a pair of black 5-3/4" headlights with H4 Xenon bulbs.
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So, the new plan for the front suspension is to make a hybrid upright using the Triumph vertical links, custom machined spindles and the Miata hubs to maintain the 4 x 100 stud pattern. The question for the crowd is does anyone know of a common ball joint or tie rod end available in North America that fits the upper taper of the Triumph vertical link? I was thinking of using the Fiat/Lada one that Canley and Caterham use, but decided against it.
Hopefully I'll be able to get home tomorrow. It's supposed to snow all night....