I don’t know why you would be looking at mortage bonds. If you are buying on a variable rate I would look at the index it is tied too. IE the LIBOR (London Interbank Overnight Rate)COFI (cost of Funds) COSI (cost of savings index) or whatever other type of financial index.

If it is a fixed rate and you ahve amonth to close I would gather up my financial information, do a query on Bankrate.com and shop around for a conventional fixed rate product. Think you are focusing on irrelevant information.