A disc and blade from any 18" victa mower will fit there are however specific utility ones. I have used discs from 18" rear catcher mower many times without them fouling anything with fitment.

https://www.outdoorking-forum.com.au/index.php?main_page=product_info&cPath=1_17_88_275_276&products_id=1702

I will grab a photo later of one of these fitted to a utility.