Lower braces used to be essential on MK1 Golfs due to the design of the shell. The chassis legs were pretty long and unsupported. VW even fitted their own brace on late Cabriolets and the 16V Scirocco.
I don't know that the Polo would need one for the street. I had one on my G60 Golf but you'd need to be pretty sensitive to feel any difference.
Gavin
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