Does anyone know where to get 73 headlight buckets?I think they're the same up to 77

 

The only ones I can find in catalogs are for '78-'79 but I've used those buckets with a '73 grill and had no problem

 

C9TZ-13119-A .. R & L Headlamp Bucket

Fits: 1967/69 F100/750 (right side only) / 1973/74 F100/350 / 1969/74 Econoline.
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D4ZZ-13118-A .. Right Headlamp Bucket (Obsolete)

D4ZZ-13119-A .. Left Headlamp Bucket (still available from Ford-retail price: $11.88 / ftepartsguy.com price: $8.56)

Fits: 1975/77 F100/350 & 1975/77 Econoline / 1978 F100/350 & Bronco WITH round headlamps.

and...

1974/78 Mustang / 1975/77 Granada/Monarch / 1977/79 T-Bird / 1975/77 Maverick/Comet / 1975/77 Pinto/Bobcat

 

C9TZ-13119-A is the same as right hand 1967-1968 Mustang (Mustang has adjusters outboard each side, where trucks have adjusters outboard right hand and inboard left hand, basically two right hand buckets). The mustang parts stores sell these, ClassicAutoParts.com has them for $14.95 each. Of course these are just the buckets, the mounting bracket between the header panel and the bucket is a different story.