DSM250 compatible transducer for steel hull

[Bridlewilde]

We are in a dilemma and are having a difficult time trying to find the correct transducer for our sailboat. We need a compatible plastic or stainless steel transducer for older components - a DSM250 Raymarine Fishfinder E62007 model and Raymarine C120 classic multi function Chartplotter for our steel sailboat with a deadrise of 20 degrees. After many hours of research and reading manuals, many failed purchases and recommendations, we have still not reached a satisfactory result. We cannot use a transom mount (we have a Mason 33) nor a bronze . We have done some reading on tilted element transducers but cannot locate any that are compatible. Any suggestions out there? We are very confused. Thanks to any who can shed a glimmer of light.
.