Found it in Snap-on it is a triple square, My local independant MB man told mw where I can get it locally, Clarke tools, its an 8 mm.

Thanks for your help

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1987 MB 300TD, 245,000 miles running great, converted to WVO.
1996 Ford F350 2WD,PSD,CC,DRW custom conversion, soon to run on WVO.
2003 Toyota Matrix,4WD (wifes)