Good luck I have been looking for awhile now with no luck. I do have the Hydroscale cowl but wanted a 1 pc for the Miller American I'm building.
This is one that I have now and wanted a similar style .
Just order some from Mark Copley. Great service and fast delivery.
https://www.mcopracing.co.uk/?fbclid=IwAR1ucOi8W0gh1NHDWwfna7p71Dvpdn9ABynXAwb5-y1iRfUhnodTV4Izi2c