Google is a wonderful tool. Not cheap though.
There was some second hand sets on Ebay.
http://www.coolairvw.co.uk/Item/Shop_by_Vehicle~Splitscreen_Products~Splitscreen_Suspension_Products~Front_Suspension_Products~Front_Beams/211411107/T2_55-79_Front_Torsion_Leave_Set.html" onclick="window.open(this.href);return false;
http://www.machine7.com/product.php?xProd=14347&xSec=423&jssCart=8e74fc9d695b0601aad40303550c2f3f" onclick="window.open(this.href);return false;
http://www.limebug.com/product/view/2968/t2-bay-window-1967-79-standard-torsion-leaves-161" onclick="window.open(this.href);return false;