Is this the original door speaker?

My recently bought 328 Euro (Swiss) model had a previously installed upgraded radio/CD player. This was no longer in the car when I bought it but I know that an upgrade was made since the wiring harness to connect it to is still wired up in the car. Needless to say that the original Blaupunkt radio does not work since it doesn't match the wiring harness.

I have bought an Alpine DVD player that I will install. Since I am doing all this work, it was suggested that I should change the speakers at the same time. A good idea.
However, given that the previous owner already upgraded the stereo system, I am wondering if he also upgraded the speakers.

Since it seems that I have to take the door panel off to change the speakers, which is a bit of a pain in the ars, I would like to avoid this if possible.
I have taken a picture of the current speaker by removing only 2 screws from the door panel and prying the panel gently open.

If these are the original speakers then it might be worthwhile to upgrade them but I can't tell. Are these original or upgrades?
Any ideas?

Thanks
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If I do replace them, any idea on the thickness of the speakers? I read somewhere on this forum that they have to be 2 1/2"" thick, is this true?
I know that the diameter is 6".

 

As far as removing the door panel, I have seen this somewhere on this forum and don't take credit for it:

"The 328 door panels are pretty much like the 308 door panels. About the same amount of work to remove as pulling a head unit.

1)Remove the door lock knob by unscrewing it.

2) Remove the arm rests
The arm rests are held on by 3 10mm nuts: 1 in front of the latch release, 1 shortly behind it, & 1 towards the rear of the opening for the latch. Then there are 2 #2 phillips head screws on the bottom of the arm rest. 1 about half-way between the latch release opening & the bottom tip of the rest, and 1 at the very tip.

3) Remove the trim screws
There are 4 or 5 #1 phillips trim screws: 1 on the cover's edge just above the latch. The others are buried in the carpet in the bottom of the door & colored to match it. All are just inboard of the leather trim that runs around the outside edge of the carpet. Their locations are: About the middle of the door's outside corner. About 1/2 or 2/3 of the way from the outside corner to the speaker. About an inch towards the center of the door from the speake opening's inner edge. Front edge of the door about level with the center of the speaker opening. The panel should be loose al along the bottom & just hanging by the trim along the window. If it isn't, go find the trim screw that's still buried in the carpet.

Like a lot of other things on these cars, the exact number & location of the trim screws seems to vary a bit.

5)Remove the panel by lifting it upwards & slightly rotating the outside edge upwards along the door.

That's it!

Be careful when removing the armrest. Do NOT let it pivot out of position as the cover is stapled on & the staples can scratch up the door panel then it's a couple of days with crack filler & leatherique to get rid of them (don't ask). Also make sure you completely remove the screws before removing the armrest as they too could make a heck of a scratch."

Hope it helps.

 

Thanks for the tips.

M.James - you make perfect sense. Will let you know who made the speakers.
Dino246gt - thanks for the encouragement, I suspect the 328 door is very similar to the 304 for panel removal.

 

Futureman:
What is the depth of the speaker that could fit in there?
Would a 6.5" speaker fit?