AudioQuest PT6 mounting pattern

which arms would be direct 'drop-in' replacements for this arm?
Linn arms. The Linn Ittok is a great arm. The AQ arm actually adopts the "Linn Mount" which is a 210mm pivot to spindle distance. Jelco (who made the AQ arms) are also this mounting.
thanks Bdgregory!
When I was looking for a replacement for my old PT6 I really couldn't find much that would have been a significant improvement. I finally opted for a Moerch DP6, with a little adjuetment (quite small actually).

unless the pt6 has bitten the dust, you can spend alot more and not necc get more. its still being made in japan under another brand name.