Looks like, from the tank, you can go Parker C6X to your steel line using a BTX nut and TX sleeve. At the filter end, you would go with an FTX and another BTX / TX combo. All -6. Except that I forgot the 8-6 TRTXN to go between the tank and the C6X. It is a -8 ( 1/2") to -6 (3/8") reducer.
