Polk Tweeters ~ what are these guys

I recently picked up some Polk speakers and I'm curious to find out if the tweeters have been upgraded. One pair of SDA 2's and a pair of Monitor 5's. The date sticker on the crossover boards indicate 1987. Both pairs of crossovers have had the caps upgraded to Solens. All four tweeters visually look identical and none have an I.D. label. One of the tweeters is silent and needs to be replaced.
I'm guessing that these are SL-2500's, but could they be the later RDO-194's or 198's, and how can I tell?m3dauet26xpn.jpg

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