diff --git a/parts.md b/parts.md
index 0737f7c..5b96d4c 100644
--- a/parts.md
+++ b/parts.md
@@ -110,10 +110,10 @@ Quarz Crystal
 -------------
 | Value       |  Package  | Owner |  Stock   |
 |-------------|----------:|------:|---------:|
-| 4.000 MHz   | ??        | uru   |  5       |
-| 8.000 MHz   | ??        | uru   |  5       |
-| 12.000 MHz  | ??        | uru   | 10       |
-| 16.000 MHz  | ??        | uru   |  5       |
+| 4.000 MHz   | HC-49/S   | uru   |  5       |
+| 8.000 MHz   | HC-49/S   | uru   |  5       |
+| 12.000 MHz  | HC-49/S   | uru   | 10       |
+| 16.000 MHz  | HC-49/S   | uru   |  5       |
 
 
 ICs