SP500 and SP400 share the exact same dimensions except for thecable opening.
Popular SP500-compatible cables include: Belden 1865A, Belden 8218, BTPA CA 0492, BTPA CA 0678, Bill Lawrence BL-150, Canare GS-4, Evidence Audio Monorail, Free the Tone CU-418, George L’s 155, Lava Mini ELC, Lava Mini Tightrope, Lava Mini Ultramafic, Mogami 2314, Mogami 2319, Mogami 2552, Sommer SC-ONYX TYNEE, VanDamme Pro Patch.