Yes, he's installed an earlier seat.   1967 still had the speaker in the top middle of the seat, not sure about 1968.  Here's the proper rear speaker for 1969 & 1970:

Thanks i have never seen this set up and it looks great i could find some panels and get them changed to my colour green but would need to find grilles, Thanks again Phil

The cheapening of GM interiors from the mid 60's to the early 70's was extreme. I look at the interior of my 69 2+2 with the cheapo jiggly plastic dash bezel and appliques compared to say a 65-66 with solid chromed metal and beautiful detailing is disheartening. Took GM over 40 years to fully recover from the "tupperware" era. The comparison of the 69-70 versus the 67 rear speakers in this thread visualize the decline beautifully.

pwm9106 wrote:

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Thanks i have never seen this set up and it looks great i could find some panels and get them changed to my colour green but would need to find grilles, Thanks again Phil

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 If you can get a chance, show us the interior colour.

Mark has entrusted me to hold on to some parts for future use.

I believe I have a dark green 1969 right rear panel with speaker grill

Not sure of what the 70 dark green looked like.

sorry took so long! I would be interested in your speaker and interior parts and will send you a pic of the colour, Also not sure but was there only the single rear speaker on the right side, May take a few days and thanks Phil

Some more photo's of the rear speaker.  This is one that was broken on removal by the yard owner, but I epoxy'd the standoff's back on.   The grille is the key to the whole thing as the standoffs poke through the armrest panel, and contain clips that serve as nuts for the screws that attach the speaker from behind the armrest panel.