Hi. Please excuse my noob question.

I'm reassembling a cooler and I'm having a hard time sourcing a liquid line filter that matches the tonnage of the unit and copper tubing size.

What do people do in this case?

1) Use a larger filter that is specified to be used in a larger tonnage unit.
2) Use the right size filter that has smaller copper tubing size. (1/4" instead of 3/8")
3) Mail order the right one and wait.

If scenario 1 is used, how do you figure the extra refrigerant you need in a critical charge (capillary tube) system? Would the extra refrigerant affect system performance?

If scenario 2 is used, would this restrict the flow of refrigerant and cause problems?

Thank you!