I think the original Meridian M lead Din connectors are:

- At the speaker, a Deltron 610-0500 (5 pins, 180 degree)
http://export.farnell.com/jsp/search/productdetail.jsp?sku=1163805

- At the preamp, a Deltron 610-0510 (5 pins, 240 degree)
http://export.farnell.com/deltron/610-0510/plug-din-screened-240deg-5pole/dp/1193814

The RCA connectors are Neutrik NYS373-0
http://export.farnell.com/jsp/search/productdetail.jsp?sku=4632898


Jerome
Music: NUC + ROCK + QObuz > MS600 > G65 > DSP8000SE + DSP5200HC.SL + DSP5200SE rears
Movies: Apple TV > HD621 > G65 > DSP8000SE + DSP5200HC.SL + DSP5200SE rears