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[Migv6 le Frog Fan]

Yep, Bose are always 2ohm, while just about everyone elses systems are 4 ohms.
No idea why, but it makes life a bit awkward. Maybe thats the point ?

[2nddaniel]

This 25/50W rating looks like it means RMS/Peak.
Does that sound about right to anyone reading this?

[LC0112G]

This 25/50W rating looks like it means RMS/Peak.
Does that sound about right to anyone reading this?

Yes, but people mistakenly believe that the power rating equates to maximum volume acheivable - it does not. A much more important figure is the speaker efficiency, which you are unlikely to get for the OEM Bose speakers. Only about 0.5% - 2% of the electrical power into a loudspeaker is converted to sound power. The other 98-99.5% ends up as heat, and that's what the loudspeaker power rating tells you - how much heat the thing can dissipate - not how much sound output it can generate.

A 2% efficient loudspeaker will output 4 times the sound power of a 0.5% efficient one for the same electrical input. You would not be able to sit in the same room (never mid car!) if you could find a 100% efficient 25W loudspeaker.

So concentrate on finding a high efficiency 2 ohm loudspeaker, and any power rating greater than 10W (ish) will be fine.   

[2nddaniel]

I thought I would add an update for anyone who contributed and for anyone searching in the future.
I successfully replaced my front door speakers.
I bought some 2 ohm Powerbass OE-6C speakers from Car Audio Direct (co uk).
Auto leads speaker adapters rings were needed as well.
As simple as that?
Course not.

The new speakers are a little too large to fit into the original speaker mounts so I did have to use the Auto leads ones, but they moved the speaker too close to the door metal, they would actually be fouled by the door metal and sit slightly proud, preventing me from tightening the speaker mounting screws. A bit of modification was needed.
I adapted the supplied bezels (the bit that the grille would normally attach to) to make a spacer and mounted it on the front of the adapters. I also cut off the water shield from the old mounting rings and attached them to my modified speaker adapters.
(I cut the bezels lip off, all the way round, as they fouled fitting the door card properly).
I decided not to try to use the supplied filter or tweeters as the vehicle wiring already split towards the tweeter and the lower door speaker, and my tweeters still worked, and I damaged one of the new tweeters trying to remove all of the plastic mountings.

The sound is excellent. I can't describe how good it feels to hear it working well after the work I put into it.

[cam.in.head]

excellent work
and also nice to hear an appreciative reply / update
so may people on forums ask for advice and never come back !