The current silicon devices being used by the D0 and CDF
collaborations for the Tevatron Run 2a, which is expected to end in 2005
after accumulating about 2 fb-1 of data, will need to be replaced due to
radiation damage for the following data collection period designated as Run
2b. We will discuss these silicon replacement plans, the more uniform
design of the detectors between D0 and CDF, and the current status of their
fabrications.