will wheels from a 1988 300E fit a 1995 420E?

you can read the specs on the tires from both cars and call a tyre shop i would think.It should be easy to find out

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Both are W124 chassis, both 5x112, 35-42 offset, 66.6 bore, and

gives pretty much the same selection ofaftermarket wheels, so they *should* fit. HOWEVER, it's best to actually try the wheel on the car before tossing the old ones in the trash.

You need to make sure that:

1 - The center bores are the same, so the wheel will self-center on the hub.

2 - The wheel bolts extend the same amount (+/-) out the back of the wheel. Too short, there's not enough threads to hold safely. Too long, the bolts can rub against the parts behind the flange, possibly jamming a wheel.

3 - The wheels clear the brakes, as some models may unexpectedly have larger calipers and less clearance. Some wheels may also have a different inside contour (and less clearance), but as all your wheels are stock MB, they *should* be ok.

Think you meant to say wheels, instead of tires. On the inside of the wheel you will find a stamping with wheel diameter, width and, most important the offset, shown as XXET.