cab interchange
 

Does anyone know if the 73 front fenders and hood are interchangeable with an 80?

Yes, '73-80 interchange.
Radiator support no in most cases...... most of the '80 model year trucks had square headlights..but you prolly already know that

I think that only the '80 Silverado came with the square headlights. The lesser trim packages had the round headlight trim like the '79 models.

i have a 80 silverado parts truck with round headlights

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73-75 76-80 and 81-87 all have little differences but are interchangeable also up to 91 for blazer and suburban
square headlights started in 81 and IMO are ugly

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square lights were offered as an Rpo option as early as 79 but i have never seen one and there is no set pattern as to which 1980 came with it.MOST but not all silverados had them and i think it depended a lot on the build date as it seemed that the early 80 models all had round lights.
Too answer the question A COMPLETE 80 front will definately fit on a 73. there were subtle differences in grilles and 79-80 bezels are different as they extend further down to meet the stainless piece that goes between the parking lamps in that year.DAVE

[This message has been edited by crossy (edited 08-26-2001).]