Free - Twin Disc MG-507 Troubleshooting Guide Parts for Twin Disc ® MG507 Marine Transmissions - Ring Gear & Rubber Blocks Section 1 Twin Disc MG506, MG507 & MG507-1 Ring Drive Housing size SAE #2 Price: $ 569.47 Qty: ^ Details In Stock Add to Cart 2 Rubber block for Twin Disc marine gears . Price: $ 5.41 Qty: ^ Pictures In Stock Add to Cart Go Back Free - Twin Disc MG-507 Troubleshooting Guide