Optra wagon 07 model | Head Unit issue

Good Day mga sir/maam just got our 2nd hand optra wagon 07 model. i have a question i want to replace the headunit bat nung nag ikot ikot ako sa marikina hindi nila 100% sure kung kaya nila i tap dun sa steering wheel yung controls. kasi po diba sa stock na head unit natin pwede ma control via steering wheel. so ask ko lang po sa mga may optra na nakapag change na ng headunit and speakers kung saang shop nyo ko ma recommend.

Im from Q.C.

thanks in advance.