I"ll be replacing the rear suspension arms on my 86 300E soon and the new replacement bolts appear to use a multi-splined tool in the bolt head. Does anyone know what type and size tool is used? Is this the "triple-square" bit I've seen mentioned in other posts? Where's a good place to find these bits?

Thanks

If it is the triple square, this bit should be available at any of the popular auto supply houses.

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95 E320 Cabriolet, 159K

Aren't they called Torx head or somthing like that?

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles

Triple square are 12 point (4 corners on a square, times 3=12).
Torx are 6 point and a different profile, more of a curving profile and rounded corners, as opposed to 12 point triple square, which although they don't look like it are 90 degree corners each.

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Lisle Tools makes a good set of triple square and TORX. You can check out their specialty tool catalog at:

http://www.lislecorp.com

Pep Boys carries a fairly good assortment of Lisle's specialty line.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"

I've found a couple of sets that are like the Lisle triple-square bit set , but I'd like to find a 12-point set in a 1/2" socket similar to these hex bits. . Anyone know who makes one like this?

S-K makes the triple square in 1/2 inch drive for the larger sizes. Take a look here: http://search.cartserver.com/search/search.cgi?cartid=a-6834&category=database&maxhits=30&keywords=sk+triple+square&go=GO%21