All early mustangs use 4 bolt ball joints.I believe the switch to 3 bolt was 70.Your 69 is correct with 4 bolt uppers.A lot of the replacement (Ford) a-arms were also 3 bolt..I have seen many that are cracked.
Cory
68 Mustang Fastback 427 5spd (owned since 77)
67 Mustang coupe T/A clone (W.I.P)
1936 Diamond T
92 F250 7.3 4x4
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