I am having trouble finding a fittng to fit on my air compressor hose that is in a metric size to fit in the socket of the glow pug. Where might I find one or is there a way to self fabricate one.

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1983 240D Yellow
1989 300E Champigne
1993 190E Gray
1986 325 BMW Burgundy
1987 Chevy S10 Blazer