Clio 182 on sportlines & f1 oz's

[Mosley182]

Hi I'm currently running my Clio 182 lowered on sportline spings. With oz f1's 195 / 50/ 15 On prada spec 2's on rear & proxy tr1 on front
I would like some help on what spacers I should run. I can get 15mm and 25mm bolt on hub spacers
I use the car every day for work and do the odd track session. Will I get any benefits from running spacers or is it just for looks.

Many thanks

Mosley