My son knows someone who rolled a panel to match the cut out original. It wasn't a very good fit, we had to cut and weld it and it will need a fair bit of filling. It is on the car though and, when finished, should look OK especially with the rear quarter bumpers in place to disguise the seams. So, I haven't really got a solution to the problem apart from saying find an old fashioned body shop with a wheel and be prepared to do a bit of fettling and fudging.