For sale: Original automatic engine belt tensioner, used, for BMW B58 engines. Belt Tensioner Assembly M140i M240i 340i 440i 540i 740i 840i X5 40i X6 40i Price: 300 SAR Shipping available to all cities in the Kingdom. To view more of our offers, click on my name and you can follow our account by clicking 'Follow' at the top right of the page. May you be in God's care and protection.