ECS, Goodridge, and turner all seem to use zinc coating for the banjo fittings. Only stainless fittings I have found is by HEL. Same price as the ECS and Turner. Prefer the peace of mind of stainless. And you can get them in multiple color options.
https://attackingtheclockracing.com/...43539401965798
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'07 Yamaha R1 (sold)
'06 C55 AMG (sold)
‘?20 M5, MP Carbon Pro Spoiler, MP Carbon Diffuser, MP Black grille and gills, MP Carbon Mirrors, CF side sills, 789M w/ Ti studs, eventuri, Dinan X pipe
'14 X5 50i (wife’s now)