Most of the plates are a standard dimension - my recommendation, if appropriate, is to invest in a precision-lift (Incra, Jessum, others) metal plate, and install support braces under the table - aluminum angle iron should do the trip. This IS an expensive alternative; however, quality is expensive once! Short of this, go for the in-kind replacement from the manufacturer - I hesitate to say this, if the materials used will warp over time. If you can get a straight & true replacement, then do the aluminum bracing to toughen the table. Also, if you're suspending a big 3+ hp router, the table needs all the help you can give it.