Chuck I got this chuck from grizzly. http://www.grizzly.com/products/H6265 for my Jet 1220 and the http://www.grizzly.com/products/H6267 for my Nova DVR lathe. I actually have 4 of the 1 1/4" X 8 because like you I hate changing jaws (read lazy). The reason I bought these is because they are a clone of the Vicmarc VM 100. The jaws of this chuck fit these two griz chuck. The Vic has a variety of jaws of which I have 4 of them on the griz chucks. I bought my griz chucks when they were $99 but still not a bad price at $105. They have served me well and haven't had one problem with them. I bought the 4 for less than what 2 Vic's would have cost and I don't change jaws.
Now to your question I can tell you I do have one of those chucks G8784 and had the PSI Barracuda II chuck which I sold when I sold my Rikon lathe. The PSI jaws would not fit the griz chuck or at least the one I had would not. Hope this helps.
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