If you make them yourself, then use decent thick steel bar. Dont worry about the shape. I used 1/8th inch steel flat bar. To raise the bike, you need to shorten the bones. So use your old ones as templates, and make them about an inch and quarter smaller, is in the hole centers. This should raise the bike up a little, then use the pre-load to make the back end lower/Softer etc.
HTH
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