Fuel Filter choice

HI everyone

i ve had my fuel filter changed about 16,000 kms ago but now i start thinking its dirty again and want to change it. But have doubts that i installed the proper one before.

So
1) Anyone installed not subaru fuel filter and what was it?
2) Anyone had wrong filter installed and what were the problems?
3) Are Legacy and SVX filters the same?

i have an aftermarket filter. not sure about the brand, maybe Ryco, part number was FI-172 which was the big metal filter. the one before was tiny plastic one. My friend has same filter as i do in his legacy and it still goes without problems (my car stalls and idles rough). Fuel pump died though, but i think it was not due to wrong fuel filter...

thx