Original rear speakers

Hi all,
Not sure if this has been raised before ( I did a search but came back with nothing confirming the make)
Can anyone tell me what make were the original rear speakers that were fitted under the parcel shelf supports.
My front speakers in my '83 GTI are Alpine, any help, as usual, is appreciated.

Not sure that even in '83 anything, apart from basic headunit wiring loom and 'Made in Tunsia" speakers were fitted at factory, it was down to the dealer to how much they could $tuff the punter for a basic setup.