cuda rear wheel opening

hope someone can provide some insight into putting a full radius wheel arch on a 64 cuda. i want to duplicate the wheel openings on the original 65 hurst hemi under glass (not the 66 everone knows). they basically mimic the front wheel opening. i have seen several cars like this on the internet to include one for sale on ebay last year. i dont really want to cut them like the 68 hemi dart, i want the flare at the top of the opening. i see bronxmopars1 has it on his 66 valiant but havent been able to reach him. i was thinking of grafting front fender openings on but not sure they will cover the rear opening. I know wagon qrtrs are imposible to find. i have considered dozens of possible donners to include early mustangs and volvo 240s! any help would be great.