190E Correct Alloy Wheel Bolt spec?

[1993190E]

Have now found a set of Alloy wheels for our 190e - these came off a 190 e 2.3 litre Wheels are : MB 15" 7 J H2 ET 44 tyres 205/55/15

Whats the correct spec for the Alloy wheel bolts?

Alloy wheel bolts on E Bay seem to be 12mm 6 cm overall of which 4 cm threaded

I want to avoid any stripping / catching on h/brake etc

Your advice sought please