I went to the Ford Show Parts site looking for a window sticker for my newer Mustang and noticed that the range for years for fox Mustangs is no longer just 1987-89. It now includes the full range of the "aero" fox Mustangs; 1987 to 1993.
Thinking I must have just missed this, I searched for when this might have gone into effect and came up empty. The only results I got were from March 2020 when the 1987 to 1989 offerings first went up.
The URL for the page still specifies the old date range. https://fordshowparts.com/collections/featured-items/products/87-89-window-sticker
Another thing that has changed is the price. Back in March 2020, the price was $59.99. Today, the site lists $79.95 as the price. Ouch. Also listed is the lead time. There is a minimum 12-week lead time to get a reproduction sticker. This is attributed to COVID-19.
I ordered one for my 1993 instead of my newer Mustang. Stay tuned...I should have an update in 3 months.