I do have a possible solution for you, however there is not going to be an option to upgrade only the housing and fan you'd have to do a complete swap.
With that being said, a great upgrade for your discontinued Dometic EZ-Breeze is the Fan-Tastic Vent Roof Vent w/ 12V Fan and Thermostat # FV802250.
This roof vent has an integrated rain cover like your EZ-Breeze, a reversible fan that can either bring in air or exhaust it out, and a remote control with an LCD screen to allow you to control... view full answer...
In reality, both the # 37207-31525 and the # 37207-30395 would be acceptable replacements since most folks aren't going to be utilizing that much gas at the same time; even running all of your gas powered appliances at the same time on maximum power, you should still not have any issues running either regulator.
If you do tend to run a lot of gas appliances at the same time then you're going to be best suited with the 345,000btu Automatic Changeover RV LP Gas Regulator # 37207-30395.... view full answer...
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