If we could settle on a particular brand (I think it's down to Baldwin, WIX and ?) maybe Rusty could offer a group buy?
I ttried to find Baldwin dealer that sells a filter for the OM603 but was unsuccessful. I hate to say it, but they may make great filters (for other than MB) but if they can't get the right one to market, they aren't in business to serve me.
I was leaving WIX as a last resort after hearing that some of their filters were made in India.
I'd rather buy Baldwin but have to special order from a tractor supplier in another county, they make it hard to do business at least in Metro SF Bay Area.

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body. '87 300D w/ Sportline suspension. No more '79 300TD w/ 617.952 engine at 367,750, it was my annual driver to Texas and I sure don't miss it poor A/C heater system!