Many VPI turntable users mount arms other than VPI's. In fact, the company has been making turntables for a lot longer than it has made arms. VPI is very cooperative in honoring customers' arm preferences.
I have used the following (in chronological order):
Sumiko MMT, Grado, Alphason, SME IV, Syrinx PU3, and for the last 20+ years, the mighty ET2 (with various upgrades)
In every case except two the improvement in SQ was significant. The Grado was a sideways move from the Sumiko overall. The ET2 was transformative in my experience; hugely better than the others in the ways that matter to me. My last tonearm.
Just get the spindle to pivot distance of the arm. If it lands on the tonearm board the arm will fit it just requires drilling a new board the right diameter.
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