Ken,
I am not a wheel expert. But my understanding is the dimensions are the same on all. The differences are in wheel style.Pre L 7s & 8s have a more rounded casting of the pentagram. The L wheels are sharper in definition of the pentagram. The 10s I have more closely match the L wheels than the Pre-Ls.
#4134 is a Pre L and I wanted the 8" L wheels to more closely match the 10s. Most people will never notice a difference. But 7s and 8s are pretty cheap so I picked up a pair from Mike Mayberry and will store my original 7s & 8s.
This link at Mike Dailey's site may help.
http://www.panteraplace.com/page80.htm
Jeff
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