I've got one of these, that fits nicely behind a front seat

Bluetooth Speaker

I've also fitted on of these to the dash. It's quite small and unobstrusive

Bluetooth Controller

Means I can use my phone as a DAB radio or MP3 player and control it from the dashboard so no chance of getting into trouble with the feds.

"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10