My answer was premature and based on posts that I had read.

Thanks Arthur. I recently acquired a '97 S320 with full dealer service records.
However, based on the fact that they left the original serpentine belt in the car for 107K miles, I don't necessarily trust that they actually did what the receipts say they did.

Anyway, I bought the three connectors and intend to change them out and check the sparkplugs as soon as the temperature abates here in Tennessee.

Steve