[A/S] Which brake backing plate for 91 LTD?

[Jerry Flanders]

Any brake DYI guys here? I want to renew the brakes on my '91 34 foot 
(6-wheel) AS trailer.

I see only one type of 12 inch backing plate assembly listed at this major 
wheel supply company's site below - does that mean that all 12 inch ones 
are the same? Sure would be nice to order all 6 and have them here when I 
jack it up, rather than pulling a wheel to check size first. But I would 
hate to deal with a return if not the right ones.

Description says 12" x 2" - is this what AS uses?

I am looking at parts 60208712 and 60208713 at 
<http://www.southwestwheel.com/trailparts/brakes/brakes.htm>

Jerry