Hello,need your help once Please,I can find some tension roller rollers and belts in the net

Hello together, the Andreas from SELM near Münster, introduced me already last week. I need from you a source where I get for my thick Bj, 14 5,2 Spyder 525 HP spare parts. Search now for an hour, Bezgsquellen for a clamping roller the two other rolls and the V-belt. From Ebay to Google to Autodoc, no one can offer me the parts-why? Thank you for help in advance beautiful Gruss Andreas