My son and I are just about finished rebuilding a 1983 1952 Capri. We were originally going to dispense with the original factory made (plywood) seat bases and purchased the Wise Deluxe Lounge Seats, mainly due to cost. We purchased the seats long before we were ready to finish all the rest of the interior because we got them on a sale. We later decided to go with a different color option, and at that time ordered the Wise Premier Back to Back Lounge with Z bar. Here is the exact model number from iboats that I ordered.
Bayliner Capri and Classic Back-to-Back Lounge Seat with Floor Base, White-Blue - Wise
Your Price: $318.99
Save: $88.00
(21% Off $406.99)
Part # WD1225-0031
There is another Bayliner seat you can order which does not come with the base, but DOES come with the factory plywood-and-pipe style mount that will fit in the base built into your boat. (or at least should, you might want to call iboats to compare the length of the aluminum pipe which fits the two slots in your seat base.)
The Z-base seat will not fit the factory built in base as is. You have to remove/retain the plywood-and-pipe mount from the bottom of your existing seats and mount it to the bottom of the new seats.
Here is a link to the Wise web site directions for mounting the three types of lounge seats they make. (Note to mods, this is a link to the manufacturer who does not sell to the public. The iboats site does not have this bit of info on it.)
http://www.wiseseats.com/#!lounge-seat-installation/c2099
The top seat is the first one I bought. Note these seats are made to fold out from one end, not both ends simultaneously like the Bayliner seats do. The middle one is the factory Bayliner design. A critical dimension as I noted above is the length of the aluminum pipe that goes from one slot to another, but this can be replaced if you are handy. The bottom one is the Z bar base, which is meant to use the supplied base and mechanism but mount on a flat floor with no factory seat base. It folds out both ends like the factory Bayliner seats do. I liked the color design of the Z bar seat, so I bought it and added my Bayliner plywood-and-pipe mount so I could use them with the old factory style base. I also found the Bayliner seats are larger, more padded, and have a higher quality (thicker, plusher) vinyl than the cheaper seats. (Go figure!)
I can put up additional measurements or pics if you'd like.