Order the sideframes for the SD7 from Atlas. This truck was designed by Kato and the sideframe snaps right in place. I just recently did this myself due to the high cost of the Kato trucks. You will want part number 535305
The newer SD7/9/24/26/35 ones do as well (though I've had one or two that I had to fiddle with to get it to secure correctly)... but they are all high-mounted triple clasp (3H) or low mounted double clasp (2L). I believe he's looking for the high-mounted double clasp (2H), currently only an option from Kato.
Thanks guys, I am looking for the Kato high brake side frames, but like I said I do not want or need to pay top dollar for them from Kato. I apriciate all the suggestions though, that is why I Like this place so much. Kevin