Transducers

I have a Prowler Trident 15 which has a transducer hole. Are most transducers a standard size that will fit this hole or do I have to do reasearch into what size a transducer a unit has before I buy a fishfinder? I mostly use my yak as a diving platform and don't need a lot of bells and whistels.  I was thinking of getting an eagle cuda 300.  Will this one fit? 

You have to get a Hummingbird then send the transducer to the factory for 1 that will fit don't think other brands will fit

Thanks Mick is that an even swap or do I have to buy it?

Thanks Mick is that an even swap or do I have to buy it?

Should be an even swap but do some research and find out the part number.  It is posted here on the board I just don't recall the number as I've never had to deal with OK gizmos.

Michael

cool thanks guess it is out for using it next weekend if I have to buy it and ship the other one back in