Either bar-dot or three-dot tritium inserts can be installed in Novak lo-mounts. We send ten or more sets of these out per week.
FWIW, I used to recommend and swear by bar-dot setups. Unfortunately, the rear bars haven't withstood the test of time and I've ceased recommending them. Great when initially installed, but the bars tend to fade out very quickly and, in a very few years, are virtually indistiguishable.
They're, of course, guaranteed/warranted for fifteen years, but it's a major hassle to deal with shipping them back for replacement. All my personal guns now sport green three-dots and the fading problems have been resolved.
----Mac