I've found some numbers on issues like this at samsungparts.com
You have your HT number so parts and numbers might be there. Sorry but I feel you need to know the how to do it and not have me do the work for you.
I bought the system Samsung HT-Z520 but it came with no speakers or remote, I found remote on Ebay but there are many different speaker models for the fronts, rears, center, & subwoofer and didn't get help from Samsung, would anyone know which model numbers are compatible or a verified good resource that I can look into? Thank you