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I put seat belts in my coupe which is similar to your roadster. I used a piece of 1/8"x2" channel steel. I made it long enough to under the sub-frame on both sides. (under the car). I would liked to gone under the frame but could not figure a safe way to do it. The belts came out from the back of the seat and bolted just inside the rumble seat area.
Seat belts with out a very good anchor are dangerous.