Need to replace speakers on a Elka x 109 organ ..old speakers no labelling

Need to replace speakers on an Elka x 109 organ ..old speakers no labeling. Have schematic and speakers are labeled
LS1-LS5 = AT50*1313*5*109. I suspect that LS1 means Loud Speaker 1 but the rest I do not understand. Can anyone help?
Many thanks.

What happens to the original speakers?
Maybe they can be repaired?
What is their impedance?

Paste clear photos of these speakers from each side, because I did not find it on the network.

Regards.

Thanks for the quick reply. As you can see in pictures, the speaker foam edge has totally deteriorated. Further checking I found the mid range are 4 ohms and looking at the amp driver specs, can be replaced with a 4 inch, 4 ohm 30 watt replacement that is easily sourced. The woofer however is a challenge as it has a center tap voice coil. Eight ohms total but split 4 ohms on each side of the tap. The speaker connections have the center tap connected to ground and the " " and " -" to each of the left and right channels of the amp. Have not been able to find a source for this type of speakers. Although I prefer to replace, I will probably have to get a repair kit. I wonder how it would sound if I replaced the woofer with 2 separate speakers, wiring one terminal to ground and each of the other terminals to each of the left and right channels. Regards

If the speakers are electrically functional, they can be saved by gluing in a new upper suspension.
Look for a specialist or service provider in your area who can do this.
If you are a patient and manual / technically efficient person and you are sure that you can do it, you can change the suspensions. You will find a lot about it on the forum and on the web.
I haven't found the original suspensions, but you can definitely choose the appropriate foam suspensions for these speakers.
Attempting to use other speakers may fail because the parameters of the original speakers are not known. In this case, the instrument may lose its original, unique sound.
You can also try to look for identical speakers on the Italian websites, although this is a fairly old (80's) instrument, so it may turn out to be completely unavailable. I tried and did not find it.

Regards.