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You'll probably need to jack the car up at the rear end of each front frame rail, under the seat, to get them on. Don't jack it and wait a week like some folks, unless your car is wood it won't help to wait.
Used this idea today to get a monte carlo bar installed. (the export brace was already out) I used one hydrolic jack and a piece of 4x4 to span over to both frame rails. Gave me just enough movement to get the mounting brackets down and flush to the top of the firewall on each side.