I used the stock 5.9 Magnum flexplate because it has the tone ring for the EFI built in, and had the converter custom made to fit. The rear half looks like the GM converter the front half looks like a Mopar converter. Precision of New Hampton made the converter, and it was a bolt in deal with the Reid Bellhousing. No spacers, no fuss, just bolt it together. It was easier this way in my opinion. They know what both parts look like and only needed the overall measurements. They have them now and can easily reproduce them by the thousands.