classic chevrolet parts, inc in OKC produces both
they've never had a complaint that I know of. (prior employee)
1.800.354.4040
www.classicchevroletparts.com
P.S. LMC's prices are awesome - they deal in such volume their markup is marginal. I spent 3 years in the biz - they sell the same parts as everyone else, unless it says "LMC exclusive"