Is this ok to use on my LSD differential

This kit is intended for vehicles with open factory differentials only. The only vehicles in this fitment guide that may have a factory equipped LSD as an option are the E30 models. For us to provide further assistance we need your year and model information. Please email service@fcpeuro.com so we can provide further assistance.

Is it possible to include the O rings in this kit in the future? 07119963355. Just a suggestion.

There is no need to include the crush washers as the updated drain plugs use a viton seal which is integrated in the plug itself. Only older style plugs (NLA) without the viton seal would require the use of the crush washer. You should not double gasket the drain/fill plug.