does your dial look like this?
if it does you're probably in luck.
remove your switch panel and see if you have an area "scored" that can be cut out [look on the back side of the switch panel]
your dial fits right in there.
if your dial looks like my first picture you'll need the euro switch panel. try parts shop here. they have the one for the w124, they can probably get it for you.
it should not cost more than $20.00 new
*92 400e 124.034, SOLD
*92 300e 124.030, SOLD