It looks like the Ariel 23 1/4 x 48 non tilt window length of channel is 23 and 1/2 inches long On the outside is 3654 FK Caldwell. Do you have this length?
Tom from SWISCO responded:
May 17, 2016
Thanks for contacting us. Please see our S745-23 channel balance to start out with. It measures 23-1/4" in length, but we believe it should still work for you. Let me know if this is a good match!