Hello all, My question is for Frantz vintage Bypass Oil Filter experts - advise needed. I bought it used from ebay (without filter element) and it came with 2 orange plastic rings: one was inside of Frantz housing at the bottom and another was suppose to be installed on top of filter element (into the housing between filter element and cover). At the moment I put inside Frantz genuine synthetic filter element. Pictures: Ring installed at the bottom of Frantz housing: Ring, which is supposed to be on top of filter element (top view, I guess): Ring, which is supposed to be on top of filter element (DETAILED top ring view from the side, which should face to filter element, I guess): All pictures/videos, which I saw on BITOG and on youtube, shows, that Frantz filter have metal retainer ring (spring metal ring at the bottom left of this page): http://dev.frantzfilters.com/products.html Video of metal retainer ring, which I don't have (see from 02:00 to 03:10): Questions: 1. Do I need retainer ring or I could use second plastic ring to seal filter media and avoid bypass of oil between housing and filter media? 2. My mechanic forgot to put second plastic ring of top of filter element - should I install plastic ring or should I contact Frantzfilters.com to get metal retainer ring? Thank you!