Are these repair bolts a Mercedes part or aftermarket? Would an alignment shop that doesn't do a lot of Mercedes know about them? Is there a part number? Are they readily in stock or special order?

Thanks for your help

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2000 E430 Sport (European Delivery)
Brilliant Silver/Ash Leather
Brabus Leather/Wood Sport Steering Wheel
PowerChip
Euro Front Bumper Strips, Debadged
E55 "Carbon Fiber" Door Pillar Trim
E55 Tail lights
E55 AMG/Bilstein Shocks
Eibach Springs, #1 Pads
H & R Sway Bars
Speed Yellow Calipers
18" x 8" SSR Integral Wheels
245/40ZR 18 Bridgestone Potenza RE960AS Tires

1986 Porsche 944 Turbo
88K miles