Almost the same question here. Getting ready to do the first 50 hour fluid change on a Branson 3510 and the nearest dealer is 40 miles away. Have tried crossing the oil filter and/or track it down by asking for an A1700 filter - all I get is blank looks.
In addition to Mr. Edward's question I'll add a request for an oil filter and hydraulic filter cross reference for a Branson 3510.
Next try is to take the used filters to the auto parts store and start comparing.