I've used them at our shop with no reliability issues. Seem to be just as good as the Febi's. I have noticed on certain cars that the new bolts can be too long, so I'll use the old bolts w/ new washers and nuts.

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'93 300E 3.2
'05 GMC Yukon XL 4x4
'05 Polaris SP500 H.O. LE