I can send you a tracing of mine for the CD5500 which might be OK? The card is about 2mm thick max.
Jack
BV10(40) BV8-32, BV3-32, MX7000, DVD1, HDR1, V8000
Beomedia-1, BS9000, BC7002, BC2300, BS5500, BM6500, BGCD6500, BM1900-2
BL5, BL8000, BL6000, BL Penta3, BL3500
Beovox MC120.2, 3000 Panels, CX50s, C75s, AND LOTS WIRES, BOOkS, MAGS n BITS (ebay sales: beo-store-uk)