I haven't found an unified alternative part topic on this forum and didn't want to register on other boards, so I post here.
I have managed to find all filter alternatives for my Volvo Penta
MD17D engine. As I live in Lithuania, our market is mostly consists brands of SCT and Filtron. My guess this applies to the whole region around Poland
Here's the part numbers:
The 3581078-7 CAV insert > Filtron PM 819.
The 829913 Fuel Filter
> UFI 24.304.00.
The 834337 Oil Filter
> Filtron OP 546. (WARNING: this filter is taller, make sure you have enough space)
All filters cost around €6 in local shops, but I guess can be bought even cheaper online.