The Vinyl Engine database identifies quite a few vintage pivot arms that match the 229.5-230mm pivot-to-spindle distance of the L07J arm. Those that pivot on a vertical mounting post of less than 28mm OD could conceivably be mated to the stock collet of the L07D tower. Arms specified at 230mm include various EMT, Fidelity Research, Ikeda, JVC, Kenwood, Supex, Thorens, and Denon. If the OD of the pillar post is less than 28mm, you would need to fabricate a sleeve to make up the difference and put a male thread at the end to mate to the worm gear of the on-the-fly VTA mechanism.
Those that mount to the flat top of a plinth could be accommodated with a fabricated turntable with a post of 28mm OD into the L07D tower. Mounting any flat-top version excentrically on the turnable could allow +/-20mm or more adjustability in PtS distance but no VTA adjustment on the tower.
Those that mount to the flat top of a plinth could be accommodated with a fabricated turntable with a post of 28mm OD into the L07D tower. Mounting any flat-top version excentrically on the turnable could allow +/-20mm or more adjustability in PtS distance but no VTA adjustment on the tower.