Took out the std vauxhall components today to fit my infinity set, Well I fitted them after making up some membranes to cover the holes. obviously someone has had the door cards off before and not replaced the sheeting.
A big thank you to Autosparks on here for the post (a while back probably) regarding using the speaker wires going to the original woofer as the input to the crossovers and then run the usual wires to the new woofers and tweeters.
I know it's not ideal to use the original wiring but I really couldn't be arsed with routing the wire from the radio into the door.
Below is the pic of where I mounted the crossover in case anyone needs to know in future. I used some double sided trim tape to fix it to the inside of the card.
Anyhow, it sound loads better, the sound quality is just soo much clearer.