There are better parts vendors than Mac's. I have ordered from them twice since they changed owners. Both times were very problematic.
The first order was sent somewhere else, and the order I received was also supposed to go to someone else. When I finally received my order, there were parts that were not shipped. (They were going to ship two,items later.). There were slight price differences, and the shipping charges were quite high.
The second order I received from them a few parts were wrong, and there were definite quality issues with at least two of the parts. Returning these parts was pretty easy, but I ended up paying the freight both ways.
I found it difficult to ask questions with their customer service reps. They are data entry people, they know nothing about any of the items they sell.
After these two experiences, I have not placed another order with them. For Model A parts I have found Berts in Colorado to be very good. They really know Model A's, and they have many original parts. They have been very helpful with part quality questions as well as making suggestions and recommendations to make the correct choice when making a purchase. They also bill actual shipping cost, nothing extra.