Honda CR-V 56 2.0 petrol v-tec

Hi problem code p2138 throttle /pedal position sensor switch d/e voltage correlation , I Have rang all the dealers to get one but not available main dealer main ,dealer said can’t get one a whole new carburettor £1500.00 , I know what I want it is the black thing on top of the carburettor , I have been on eBay you can get one , but not for my model of car , question can I put any different on my car is it standard for all the models , please can you help the car goes into limb mode I don’t want a whole new carburettor .