Martin, I just double checked and mine are the NC series. But I tried a NB seat from a friends Miata, and it did fit as well.

Many thanks Clyde, I have them in a Moke (had to swap right with left as the tilt lever fouled the body) but I took the adjustment slides off to reduce the height, so I can't test fit them to a PU. Very comfy!

Martin, Absolutely will fit in a Pup. I have some of the same vintage as RedRiley's (Miata NB series) in my pup. The seat, bottom and back is much thinner than stock so allows for more room. I'm 5'11" and I can fit in them with out any issue. You can even find a good combination between sliding them forward a little and leaning the seat back for the best position.

I'm not sure how tall you are, but I have stock seats in my pickup.  The foam was pretty much disintegrating, so I purchased some sheet foam on-line is 3 different thicknesses.  If I remember correctly, I used some 3 inch foam for the seats with some 2 inch thick foam cut in a wedge shape to form side bolsters on the seat.  I used 2 inch foam for the seat back.  When done, I found the 2 inch foam for the seat back was too thick and pushed me too far forward in combination with the higher seat thickness.  I ended up changing to 1 inch foam for the seat back and cut off the bolsters on the sides of the seats.  That made the seating position just right for me.  Your experience may differ with different body size.  
Don

I'm not sure those highbacks will work.  Those seats look fairly meaty.  There is not much room at all before you're pushing on the back window.

Yes, I had them in my p'up and was going to color them as redreilly did. Then found a red pair from a smart car. Sold them off.

Thanks Brian, I'll be getting a pair then. I don't need the tilt function but I'll install them so they can tilt forward to access the battery.
Thanks again, Martin.

These are in my Elf. They should fit fine side to side, but the tilt function will probably be basically useless. 

I need some seats for my pick-up and can score a great deal on a pair of 90's Mazda Miata seats, I'm wondering if they will fit in my PU. I know they fit in a Moke (after swapping the left with the right) but I have to pick them up in CA and it's a 3 day camel drive from Kanab, UT and I don't want to get them home & find out that they don't fit. The PU is real-estate challenged in the seat department.
Thanks, Martin.