Need to pull a 126 differential cover. In the lower left hand corner is an arm-support with an upper/lower rubber bushing. A bolt goes up thru the bottom of the lower bushing.

A Torx T55 bit seems to fit fairly well; however, the 126 CD-Rom refers to it as "serrated". Reading through other posts here, it seems there's a difference between TORX and SERRATED. The metal on the bolt head appears to be VERY soft. I've tapped it a few times with an impact driver to loosen it and have tried the gently loosen it with a Torx T55. It's not budging.

Would anyone know the correct socket to use here? Thanks for your time.

This bolt as well as many head bolts use a SPLINE style head. The sizes are metric, M10 & M12 are the common sizes. Snap-on, Mac, & Hazet all have these spline sockets.

This same type of bolt head is used on (older definitely, maybe current) Volkswagen CV joints. It may be easier to source it at a local parts store if you describe it as such.

Good Luck

Doc/RTH

Thanks for your help. Lisle Tools makes a set that I just saw at a mass-marketer.

Just out of curiosity, which “mass marketer” did you find them at? I’m always looking to stay current with good sources.

Thanks

RTH:

I saw them at Pep Boys. Cost was around $10 for a set. I'll reply back to this post tomorrow with the actual Lisle part # after I make the purchase.

Regards.

The SPLINE style head that DOC referenced above is also available at Pep Boys. The tool mfg is Lisle Corp. Part is named "12 point bit set". Part # 60750. Viewable at their WEB site:

http://www.lislecorp.com

Click on Special Tools -> Catalog -> Fastener

Lisle tools are widely distributed in the U. S. and Pep Boys is certainly not your only choice. Stahlwille, Hazet, Snap-On; Mac also carry this item.

In closing, the 12 point bit is also known as "triple-square" and "XZN". A sales rep at Baum Tools told me that MBs use TORX, XZN, RIBE in addition to traditional bolt/nut patterns.