Standard on Belgium/German 404's and some 411's. Direct fit replacement on Swiss 404's. Fits both right and left side. Current brackets being delivered are in OD Green. MB currently wants over $230 each! Tip......The 2 mounting holes are the same mounting for the 406/416. We have a number of customers who purchase these and simply mount with 2 bolts, or weld a plate to pick up the 3rd hole. The arm itself if identical, it is just the base plate that is 404/406 specific.