Check the listing for details. NEW WHEEL O RING 20" Rim - M923A2 M939 - 2530-01-303-0801 12363606 oring - USA. Color: Black, Condition: New. Listed at 11.99 USD. You are looking at a USA made new production o-ring that fits 20" two piece "combat" rims for M939 series military trucks and some LMTV combat rims - DOES NOT FIT MRAP RIMS. They are 1/4" thick, 20" in diameter, and made of ozone-resistant polyisoprene rubber guaranteed to last. These are not old surplus o-rings but new 2022 produced ones. Please check your rims for needed o-ring size before ordering, different model rims may require different diameter o-rings. Opened packages will not be exchanged/refunded. Shipping is FREE with this item (cont. US). Buy in confidence! Check my ebay feedback, I stand behind what I sell and have used these on over 60 M923A2s! Fits: M923A1, M923A2, M934A2, M936A2, M929A2, etc..