They will fit and work fine, no technical reason they won't work, but they will sound a bit different. Whether that's acceptable is how they sound to you. I have those 45-711 tweeters in my HPM-900s, because they gave a little more high freq output to the 900s which I needed in the room they're in. The stock 45-717 Polymer Graphite tweeters are flatter, more neutral sounding to me.