Sadly, the original style regulator is no longer produced.
The new style (current production) is a retofit but requires replacing the blower motor as well to mount it and to keep it cool.
The job is an easy D.I.Y. but the parts are spendy.
If you can find an old reg sitting on a shelf somewhere, buy it.
When my 97 E420 reg. died, I looked through H**L and high-water to find one. I never found one, even at a wrecking yard.
I then broke down and bought the new parts.
Works good as new. Granted, $750 invested.
Sorry.
DR.D