Pair of Adjustable Rear Spring Plates for Swing Axle Suspension: Beetle (1960-1979), Type 3 (1961-1968), Beetle Cabrio (1960-1970)Good Quality Aftermarket adjustable rear spring plates for Swing Axle suspension. These adjustable rear spring plates are designed to ease the adjustment of rear torsion bars on swing axle suspensions. They are compatible with 21 3 4" torsion bars, which were standard on most late swing axle vehicles. If your car doesn't have these torsion bars, they can be sourced from a donor vehicle or purchased separately. To complete the installation, you'll need