The Glock 23 is based on the TM Glock 26. Not all parts are compatible with a TM Glock 17. With that said, part #50 is the hammer roller in the Glock 23/27 manual. Is it the same part you are looking for?
Also, getting KJW parts is easy, just email them at
kjworks@ms47.hinet.net with the parts numbers you want and they will answer with a total price with shipping. They accept Paypal.