A customer brought me a Stihl 025 saw that he bought in the early '90's. I'm looking for an air filter, which to me ought to be pretty straightforward. But it's not. Stens tells me the air filter that fits the 025 is part number 605-687. But that filter looks nothing like the one that's on the saw currently. I did a search on ebay and found one that matches. It says the Stihl part number is 1123 120 1621 (or 1622). How come there's no aftermarket part for this filter? I get all the funky equipment in my shop, it seems. I'm gonna hafta stop taking Stihl. They're just a pain in the rear, and I can't look up parts for them anyway.
Where do you suggest I get the right filter for this?