Utica-Dunkirk 43360408 Coil Kit

Have 20 yr. old booklet for u201cultimate pfu201d series boiler and need tankless coil. Will single pass or two pass coil each fit? Have numbers 433-82-255 and 433-82-259 respectively for those coils. Any help would be appreciated.

Please reply us the model and serial numbers off the unit to check and will get back to you on next week.