RSR vs Turbo Flares?

[EWPurdy]

Looking to create a 74 IROC RSR replica out of my SC and I had a few questions on flares:

1) What is the difference between Turbo and RSR widebody flares? I know they look slightly different but are there size differences?

2) Is there a source for steel RSR flares?

3) If not, will an RSR bumper mate up well with steel Turbo flares?

Thanks as always for the help.