Scambiatore primario caldaia Riello Residence 24 KIS DGT6 3S ,rotto. Ma si po cambiare

Primary heat exchanger in Riello Residence 24 KIS DGT6 3S boiler, broken. How to exchange it Where did I find it? https://www.ebay.it/itm/194363430996 MONOTHERMAL PRIMARY EXCHANGER FOR RIELLO FAMILY RESIDENCE AQUA OBLO' BOILER PRIMARY EXCHANGER FOR RIELLO BOILER climacore seller It can be installed on the following models: Caldariello Aqua 24 BIS Family 26 KIS 3S Oblò 24 KIS 3S/28 KIS 3S Oblò IN 24 KIS 3S/28 KIS 3S Prontacqua 24 BIS 3S Residence 24 IS DGT 3S/24 KIS DGT 3S/28 KIS DGT 3S Residence Aqua 24 BIS Residence Externa 24 KIS/28 KIS Residence IN 24 KIS/28 KIS Family 24 KI Family 26 KIS 3S Porthole 24 KIS 3S Porthole 24 KI IN 24 KI porthole IN 24 KIS 3S porthole Residence 24 I DGT N Residence 24 KI DGT N Residence N 24 I Residence N 24 KI Residence N 24 KIS 3S Residence N 24 IS 3S Residence Externa 24 KI