I know this is not quite an answer to your question but still; I personally have reproduced the OOP shields I needed (mostly the old chaos and undead ones) usin "instant mold" and "super sculpt". Getting a good mold can be tricky, but once you have one you can reproduce the shield rather swiftly. You obviously need at least one original shild for this, and it will only copy one side, but the oldschool shield have a flat featureless backside anyway.