Go to Kubota.com and search the illustrated parts list for your tractor. Keep the model number fairly simple when searching - i.e. use L185 and not L185DT. That way you will get as many results as possible.
Next to some or all of the tractor models you will see "local options". Select one of those and you will see accessories for that tractor. You whould be able to find what you are looking for and then select it for the parts list of that accessory.