The converter came with the chevy trans. I had to use some spacers (washers) between the flywheel and the converter and then bolts with nuts to hold the converter in place. This converter did not have threads like the original. However, I did not want to use that converter, since it was in a ST-300 trans. I'm not sure why I had the spacing issue, but it may have been due to the BOP to Chevy adapter plate.