Marineland (www.marineland.com) does not list the 160 as either a current or discontinued item, though I have seen a few images via Google Images search. The Penguin 160 and 300 shared the same size cartridges. (Someone in Canada had a 3-pack with 160 & 300 on the plastic bag.) I also saw several hits that listed the 160 fitting the current Marineland Rite-Size "C" filters.
Presumably, the 160 falls somewhere between the 150 (current) Rite-Size "B" and 170 (discontinued) Rite-Size "C". If you wish to stick with the old filter, take the old cartridge with you to the LPS and see whether you should try size "B" or "C".
If neither size is close enough for you to be willing to buy and test fit, then you are probably looking at buying a new filter unit.
However, there is an alternative: Reuse the old cartridge frame to make your own.
Presumably, the 160 falls somewhere between the 150 (current) Rite-Size "B" and 170 (discontinued) Rite-Size "C". If you wish to stick with the old filter, take the old cartridge with you to the LPS and see whether you should try size "B" or "C".
If neither size is close enough for you to be willing to buy and test fit, then you are probably looking at buying a new filter unit.
However, there is an alternative: Reuse the old cartridge frame to make your own.
