Pic of the floor after I pulled the rugs and seats. They look like a smaller version of the plugs in front and rear of the buckets.
Larger openings are 1-1/2" holes The ones under the seat are 1 " holes ; same plug style.
Thanks for the pix. Looks very similar to when I first removed my moldy carpeting, except you have much less rot !! I didn't take many pix though........