B&m flexplate 10236 for 904?

The stock 318/904 plate I have is different then the stock 360/727 plate I have. The 318/904 is a 10 3/4" converter and the 360/727 had an 11 3/4". So the stock plates are sized accordingly. The b&m plate I bought is only drilled for the smaller diameter converters, maybe the one you have is bigger and double drilled for large or small converters.