I buy all my pump parts from US Diesel. They sell OEM Stanadyne and Spaco aftermarket. They sell and ship to anyone. These are the prices I paid around a year ago. May of gone up.
www.usdiesel.com US Diesel in Fort Worth Texas is a dealer and will ship. 800-328-0037.
JDB seal kit - Stanadyne # 24371 - Spaco U24371 $12.10 JDB pilot tube - Stanadyne # 16320 - Spaco U16320 $4.83
JDB pump vanes - kit 20803 - Spaco 09528