[TowerTalk] Equalizer plate dimensions

[David Aslin G3WGN]

Hi Towertalkians, 
I have a pair of telescopic towers that are similar in size to a US Tower HDX-589.  The manufacturer specifies guying at 3 levels, but does not provide equalizer plates.  I'm mindful of the Towertalk prime directive, but as the manufacturer is no longer in business, I can't consult them on this topic.  Seems to me that equalizer plates are a wise precaution at this high wind location, but I'm open to the wisdom of the Towertalk crowd.
In order to fabricate some 3-way equalizer plates I need dimensions of, for example, the Rohn equalizer plates.  Would any kind soul care to measure theirs or provide a specsheet that shows plate thickness, hole sizes and placements? The Rohn catalog is silent on the key points!
73, David G3WGN  M6O