Those perches look perfectly fine from what I can see in the pictures. The blocks just look like they don't fit (too big). Maybe they were for a domestic truck application that has wider springs?

Get a block that fits, or build your own out of box tube. If you build new perches, build them out of box tube as well. 2.5" square with 3/16" or 1/4" wall works well and is a common size. Don't use solid. :p

Some I made a while back:

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'97 4Runner, '06 F350, '86 4Runner, '05 WR450
http://home.4x4wire.com/erik