In a recent post I was having trouble finding a freeze plug for my 7234 and someone suggested I go to partstree.com. I think they had diagrams for my CC so they may have the 20HP model as well. Other than that there are lots of people on here that buy manuals so if there is something specific you need most folks are willing to help us all out here. I bought both manuals when I bought mine and I 'think' they cover the older model of yours, the 7192/4/5.