A friend of mine has some that sound similar. His are universal truck replacement seats. When you buy them new, you tell them what truck they will be going into. They have a bracket that mounts to the stock bench seat mounting points and connects the mounting points with pieces of (I think...) square tubing. The tubing has all the appropriate mounting points to fit the mounts on the bottom of the seat. If these seats are like that, and you can find out who makes them, you might be able to buy the proper mounts. Otherwise you will probably have to do some fabricating.
Slonaker
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