are you providing the appropriate capacitors to them already? or you are looking for them to provide the caps for you. i suggest you source the caps yourself using the mother thread to get the exact quantity and model, then find the appropriate shop.
i don't know any shop around your area but look for electronics service technicians who do PCB soldering and repair. better if you can find those who specialize in surface mount soldering although the caps are basic through-hole soldering. if they surface mount, they tend to be more experienced with sensitive electronics like your ECU!
ordering those caps from digikey is totally a guessing game if you dont know what youre looking at
In the very first post all available caps needed are listed and linked. All you have to do is click the links and add to cart. Even if you leave the site your cart stays. That's how I did it. And I saw you posted a question in a different thread about not having the exact caps your car called for. If they don't have the exact voltage your car calls for a higher voltage cap is ok.