We understand your frustration with receiving this type of news regarding a part that is needed to operate your machine. Unfortunately, as companies count on other companies to satisfy customers and to achieve success, mishaps do occur. Changes within parts occur as the manufacturers are producing a better product, which does in fact cause the unfortunate mishap of parts being put on back order or being discontinued.
eReplacementParts.com is a distributor for over 200 different manufacturers. Unfortunately, just like you, we are at the mercy of the manufacturers. They most definitely do the best that they can to keep customer satisfaction as well, but they also receive their product from other sources.
However, keep in mind that as changes progress throughout this industry, all companies involved have a desire to achieve one goal . . . customer satisfaction, not only with the product itself and all companies involved, but most importantly your satisfaction as the customer.