Another alternative, have them made custom. www.sendcutsend.com Great way for rodders and racers to get small parts and brackets laser cut from sheet. Especially if you've got something outside the ordinary. figured I'd post this just in case someone in the future is searching for a way to fit something together.
https://www.speedwaymotors.com/Rear...-2-1-4-Inch,384440.html?OriginalQuery=9161970 or https://www.speedwaymotors.com/Rear...bgpGU6yBtKxS8rEW-mYkMJt6nHp43tGIaAtXmEALw_wcB Might work depending on the spacing of the bolts