Vendor for exhaust flanges

[wmc2004aug at bellsouth.net]

Hay Y'all...

Looking for suggestions on where I can buy pre-cut exhaust flanges for a
DIY weld-up system that will bolt to the stock cat', header pipe, muffler,
etc.  Any ideas?

Thanks,

    -Wayne    '93 SE-R / '93 NK2k / '90 Miata