John Deere 6620 Tractor Tail Light. This listing is for the pictured Genuine John Deere 6620 Tractor Tail Light. Pa rt number – AL210180. Also collect from our showroom offering a HUGE range of John Deere mowers, Stihl garden machinery, Le chameau footwear, Teng tools and children’s farm toys. Farol ltd John Deere Dealer, Rycote Lane Farm, Milton Common, Thame, Oxfordshire OX9 2NZ. Official John Deere distributor established in 1976, Farol Ltd is a 100% family owned business with over 230 staff. We offer Genuine new & used parts, as well as agricultural, golf & grass and plant machinery from 6 branches across Central & Southern England.