This offering is for a wire paper extension that catches the pages as the exit your fax machine! your fax machine has two wires that look similar - this is the shorter of the two wires or the one one that is in FRONT. This Brother part is specifically for the following fax machines: FAX575, FAX-575, FAX-817, FAX-817, FAX827, FAX-827 Don't see your model number? Send us a message as we are happy to help!