You see, it is much like anytime a distributor goes to a manufacturer today that offers the same product to many resellers. You go in, look at the menu of accessories, options and badging options, then they build it to your specs. There is much more of this going on in manufacturing today than most people realize with the high-tech and super high speed capabilities of todays modernized plants. This is one of the reasons for inefficient operations losing mfg time to others, whether here or abroad.
Take Slingerland's move from Niles to Arkansas, then to Ridgeland, SC. The plants upgraded and became more and more efficient at building the drums, and they then began to look like every other set of drums on the market, and all the big 3, by this time, got lost in a sea of mediocrity. Efficiency does not always equal more profits, as all too many American companies have and are finding out.
As for the hardware, that likely would have been picked out by the retailer, and the ability of the salesman to up-sell, or the customers' requirements.