New, cover for Alpha 87A or Alpha 89, RF Concepts Part # MSX-X688. Price $115.00 plus shipping to CONUS. Prefer US Postal Money Order. Add 3% for PayPal.
Shipping should be about $15 to $25 depending where you live.
Chet - K8YTO
(I also have a used front panel in good condition, some paint repaired on it, with four good switches for $35)