Co-axial cable and wiring loom.

[robant251]

My car is a 1998 328i convertible. I wish to replace the co-axial cable running from the aerial on the right hand rear wing to the radio. I have traced the co-ax and loom to the left hand rear seat well but before I start pulling up carpets or dismantling dashboard panels can someone tell me exactly where the loom and co-ax run from there? Do they run down the LH side of the inner sill, down the transmission tunnel or where?
Regards.
Bob Riley.