I currently have a FWT647GHS1 that isn't worth repair. I also have a matching gallery dryer stacked on top of it now. Does Frigidaire make a new model that will allow me to stack my dryer on top of or do I have to buy a new washer and dryer?

Please help me.

Unfortunately if your current unit is older than 3-4 years you will need to look at investing into a current Frigidaire set of appliances. I say this because they are now made deeper and a slight wider than your unit. You can contact Frigidaire to see if they have any rebates or promotions on new units, or see if they provide any pre-existing consumers discounts. Their new units are the biggest cubic foot capacity on the market and truly have a long list of features that most units do not. They are a nice investment if you do scheduled maintenance on them from day one.