Thought I'd chip in here and verify that Monroe REFLEX struts are, indeed, being discontinued for the Bonnevilles. My son is the service writer at an independent auto shop and did a lot of checking with NAPA. According to the persons he talked to, there was some sort of problem with the REFLEX strut on the Bonnevilles and Monroe was no longer providing this shock for them. That'* the story he got anyway. Once the current stock is gone, that'* it.
Mike tried to locate a set of REFLEX struts for me, and thought he did. But, alas, when we got them they were actually (Monroe) SENSA-TRACs. :o No worries, though, after 180+k on the original struts I could probably cram some WalMart specials in there and still see a marked improvement!
Bottom line seems to be if you manage to get REFLEX struts, they're likely to be the last ones you get. I'll let you know how the SENSA-TRACs ride once I get them in (after Christmas!).
BTW, my SSE does not have the elecronic ride control, but it does have rear load-leveling (ELC). The SENSA-TRACs I got are direct replacements.