I don't know if a 77 ever came with those bumpers, but that's what's the parts catalog lists for the options for a 76. This will probably be the thing to check at a blumo convention, where we can park a 76 next to a 74/75 and see if we notice any differences.
I wrote: > If I remember correctly, California cars in general had to have the > bumperettes, so this [bluesmobile fall-a-part bumper without > bumperette holes] even shoots down the theory that all the cars > were from California (at least the bumpers).
Here is the paperwork that shows that 1974 California Monacos had to come with bumperettes (the option pricing paperwork for the M85 bumperette option).
Well, actually it doesn't say that. It says that bumperettes are required on all cars registered in California. It doesn't say that all cars sold in California will have the M85 option included (although that seems to be a reasonable interpretation).
Notice that M85 bumperettes are included with A06 and A08 options. They look like common options, so it seems that many Monacos would come with bumperettes (which seems to be what we see - that non-bumperette bumpers are more rare).
Here's what was included with A06 (easy order package) and A08 (luxury equipment package):