78 and 79 have special and standard framed models.........You are after the standard frame so can add the 78E and 79F to your search,
Frame no's....... 78E, 2F0-000101 to 2F0-020000........... 79F, 2F0-020101 to 2F0100000 .........
Not The Special 78SE or 79SF or 79SII, (Special 2)