1993 190E 2.6

Bought a Mahle filter and it didn't come w/ the crush washers. So, I annealed the old ones with a butane torch and lapped them with 600 grit on plate glass. Best I could come up with. It would make me feel a whole lot better if somebody else would post that they had done the same thing and it worked fine. So far no leaks. I was extra careful with the fittings and hard pipe as well, knowing they break if hamfisted.
In the future, what filters actually do come with the crush washers so I don't have to bite my nails off worrying about leaky washers? Also what are the dimensions of the old ones and where do you have to get them? Don't see it in the Fastlane which is where I like to buy parts. Dealer item?
And while I was under there, I noticed I had no plastic bellypan underneath the engine, which is what I thought came on these cars. Am I wrong? Fuel pump area had the plastic cover intact. I don't think from the looks of it that anyone has ever touched that area.

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)