This has been discussed ad infinitum here:
http://300mclub.org/forums/index.php?sid=426876de8fc01e7e267dc347d2afee34

I replaced my front struts at about that same mileage on my Concorde
(same car mechanically), and I couldn't tell any difference with the new
ones - and my car gets beat pretty good on a gravel road on my way to
work every day.  So, unless you have some good indication that they
really need relplacing, you might just save your money (for when they're
really needed, if ever).

Basically, your choices are three flavors of strut in OEM (different
handling packages - the ones for the 300M Special would be the
stiffest/roughest riding), or, in aftermarket, KYB - one flavor only.  I
put KYB in my Concorde.  Haven't read anything bad about them on the
various LH forums, but you do have a choice on stiffness with the OEMs,
which a lot of people also do choose to go with.

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')