'78 Parking Light Housings replacement
 

It looks like the complete front fascia has to be removed to get to the parking light housing attachment fasteners. Is this correct??

Pics. Not sure what your talking about.
Side markers, or turn sig’s?

burd - you're like me, I call them turn signals, but our host calls them Parking Lamp Assemblies and NPD calls them Parking Light Housings in their catalogs. (not side markers)

You can remove/replace the parking lights in the nose.... the 2 bolts are tucked up in there but can get to them with a little ingenuity and a long extension on the ratchet, a swivel might help too. Its very tight in that area but they can be removed.