Hi,
I have the kit fitted in my 1st gen cooper, ties in quite nicely with the stock harman kardon system.
I'll post some pictures later as my install is a bit stealthier to keep prying eyes out
(I obviously live in a rougher area!!).
I got mine for under £30 brand new from Ebay,
Can't recommend enough, good quality kit and fairly straight forward to install,
Cheers,
Rich.