Can you not use the Z158 on the RWD? The 4ages originally came with a Z158 (I know blue top did at least). Then when things became more cramped they moved to the Z386..both fit though z386 has less capacity (also fits my friends charade ). I rather using the large Z158. I think Rycos are good. I use Coopers as I can get them for about 6 bucks each. I've heard they're about as good as the Rycos (most mechanics use them..probably mainly because they can get them at a good price though).
There was some dude that did a study on the oil filters using mazda v6 as test engine (on internet though) and found the ryco and coopers to be as good if not better than genuines (wasn't incredibly scientific though. I'm only being a parrot and resaying what other people have said though.