It may also be the most expensive, but Rare Parts may be the easiest choice for good quality parts.
https://shop.rareparts.com/search?ye...C&model=LEMANS Our host Ames Performance probably also has them, and there are any number of online sources like Rock Auto. Don't overlook your favorite local auto parts store - they may be able to supply the necessary parts as well, but be careful about what brands they can provide.