In the spring supplement, pages D-14 through 16, and 28-29. Or, if it's more convenient, a sampling of stock numbers:
24-451-01-5 brass
49-941-20-5 brass
49-941-22-5 brass
49-941-50-5 brass
41-830-51-1 tin alloy (from China, not Israel)
If the specific kind is unknown, I'd be perfectly happy just knowing what color it is.
Thanks.