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The 73 and later A body cars with 10 inch front drum brakes use a different knuckle than the 9 inch. The Disc brake UCA uses the larger ball joint, as does the 10 inch drum knuckle.

Franken does the 73-76 9" drum spindle use large or small upper ball joint?

the 9" has the small upper

9" front drums were not available for '73-6. For '73-6 there were only 10" front drums or front discs and they both used the larger ball joints