Jim answered my questions on another forum, but if anyone is interested here is the information I was requesting. Thanks again Jim!
The only real choice for a machine torch for the 45 is with lead lengths, the standard one is 25', which is probably the right choice for your machine.
Part numbers for Powermax 45 machine torches:
25' machine torch assembly 088010
35' machine torch assembly 088011
50' machine torch assembly 088012
The consuumables are the same as the hand torch with the exception of the shield, which is 220673