Which GPS manufacturers have transducers that will fit OK 13 transducer cutout?

Hey all,

my cheap ff took a crapper and I'm going to upgrade to something else. Looking for which ff brands have a transducer that will fit into the cutout for mounting transducer. Realize I might have to modify the transducer bracket but as long as it will fit flush under the yak, I'm open. Saw that Humminbird has one made specifically for OK, but it cost extra. Heard that you can buy a new Humminbird unit and send in the trans that came with if and trade for the kayak mountable unit. Any help or suggestions appreciated.
Shannon

When I owned my OK T-13 , I just went to the H-bird web site looked up the FF/GPS model I was interested in ,found the corresponding transducer for the OK and FF/GPS ,I had the 688 ci HD DI Xd Combo  and yes to the send in ,at least it was 3-4 years ago .

good luck

I have an  trident ultra but im not sure if its the same thing, my  lawrance downscan fits perfectly flush after some slight modification to the mount, the garmin ones will sit a little higher inside the hull and the hummingbirds fit perfectly.

Thanks for the information!!