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Guess vendors wouldn't have any idea as to how long to make a set of custom wires. There could be a number of places to relocate the coil packs.
I would go with bulk wires and connectors. Just about any of the aftermarket wire companies should have bulk wire and the ends. Check with Moroso, MSD and Taylor. Summit Racing will have links to each of those companies web sites and they probably sell the make-'em-yourself kits.
Look for lt1 cut to length wire sets. The optispark has the same connectors as our coil packs. That way you can get the wires you want at the length you want for about $50-100, and crimping them is real easy.