I know it's not a Skoda but you or someone may have a Mk5 Golf I have for sale a custom made subwoofer box to fit a Mk5 Golf has carpet finish which matches boot area Carpet finish of a Mk5 Golf 
the Sub is a JL Audio 10 inch 10w6v2-D4 very heavy and powerful 
 

excellent setup was used in my Mk5 Golf 
paid quite a bit of money for this custom setup strong fibre glass construction.
could sell amp separately if you just want the Subwoofer .

check this website of sub info.

https://audiovisualworld.co.uk/jl-audio-jl-10w6v2-d4-w6v2-series-10-4-ohm-subwoofer.html?gclid=Cj0KCQjwnpXmBRDUARIsAEo71tQAW21wuOBLLVSsu-bQlZGLfNyFLE50TOdikEHnGvpXCFAdFQ6-R2MaAs45EALw_wcB

 

£200 *Sold*

 

location Birmingham or can deliver for a fee.

Edited 19 May, 20197 yr by a3quattro

Open to good offers.  

Edited 19 May, 20197 yr by a3quattro