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Theo,
The shims are made by Cessna and are available from a Cessna parts
distributor.  There are many angles available; some are for camber and some
are for toe, others are a combination and that's where it gets complicated.
Finding the right combo is tricky.  Determining the toe and camber as it
exists is easy.  Load the aircraft to your typical weight and place the main
wheels onto two one foot square sheets of thick aluminum each side (.040"
min) which have been greased in between and wiggle the wings a little untill
the wheels find their spots.  Measure toe and camber against the wheel
edges.  Be sure the axle nuts are TIGHT on the wheel bearings.  When adding
large angles the bolts will bend as required so only use them once.  This
can cause concern.  Look into the Cessna parts and maintenance manuals for
guidance.  The Cardinal books are familiar to me but a high performance
retractable such as the C-210 or C-182TR may be better.  Those books sell
for about $50 ea., also from Cessna.  Be sure to do a retract test to see
what clearances might have changed in the wheel well.
The shims come in thin thicknesses for less than one degree of change and in
thick sections for changes of, say, four degrees.  They also sell for about
$50 ea.  They are perfect, though, and are the best you can get.
Unfortunately, they cannot be returned if used or even opened.  P/n
0541157-5 and 0441139-6 are thin toe only shims, p/n 054111-2 is a thick
combo shim with large camber and smaller toe angles.  There are SO many.
The thick shims are about 1/8 to 3/16" thick at the thick end and they vary.
I hope this is helpful info.  Be sure to have clean flat surfaces and new
bolts on final assembly.
Walter Dodson

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.