I had a 6 inch wide x 48 inch long white threshold custom cut to 5 3/8 inch width. It was cut exactly to specification and the edge was polished and beveled as the original 6 inch. The threshold was nicely packages with custom fit foam for shipping so no damage occurred during shipping. Pricing was a bit high but very pleased overall with the purchase, I would recommend purchasing from this company.
The shower threshold I ordered was cut to the exact length I needed.