MRC 2178 - Captive Nut and Cage, 5/16" UNF, Front Wings and Door Hinges Land-Rover Series 2, 2a, 3 and 90/110 Defender £0.70 Quantity: at £0.70 each Out of Stock Out of stock. Captive Nut and Cage, 5/16" UNF, Front Wings and Door Hinges Used in various applications: Series 2a from October 1969 onwards to secure door hinges to bulkhead. Series 3, all models. 90/110 Defender with 5/16" UNF fasteners. Will also be required on earlier models repaired using the later 'Series 3' type door pillars. Sometimes called 'J-nut' or 'U-nut'.