blue filter is 3/8" o.d.,fram clear is 1/4" o.d.,not sure on replacements,i would imagine any parts store would have them.How about $12 shipped for all 3(with thermostat)?
I'm not interested in the plastic filter. The blue one would look nice but I need 5/16 :( I wouldn't look so nice with adapters.
How about 8 for the thermostat alone