I pulled my front calipers on my 1992 300ce to replace my discs.

Put the old bolts back in, with some good loctite.

All is well.

I would think its ok to use the original bolts as long as you clean them and use some loctite.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon