Ah, ok.
First thing you would need to verify is if your loader control valve has a power beyond port as this isn't necessarily garaunteed on a smaller tractor. Newer GC1705/1710/1715/1720 (like I own) loader models have Nimco Valve's that don't possess a power beyond port thus requiring the use of an electronically activated diverter valve 3rd function add-on which is added inline to either you dump/curl or lifting/lower circuit.
I'm not entirely sure what valve body older GC23xx and GC24xx systems used. Should it have a power beyond port you can buy pre-configured kits or build your own kit which are both cheaper than anything OEM/Dealer installed as an aftermarket. The toughest part will be plumbing/wiring in tight spaces, matching an converting fittings to make sure everything mates properly, and keep stuff out of harms way. These little machines aren't swimming in space for add-ons to be installed.
Some people might argue that these machines aren't big enough for such an add-on but to that I say it's purely user discretion. I've seen this class of little tractors do some great work with a 3rd function setups and a grapple attachment or a plow blade whether it's a MF, John Deere, Kubota, ETC. The videos are out there to watch.
