What base fits my Christensen arms rifle?

Christensen Arms Bolt Action Screw Diameters:

Early Ridgeline
Based on Savage Action
Serial Numbers Starting With CB
Lower Than CB00909
#6-48 Screws

Early Ridgeline
Based on Savage Action
Serial Numbers Starting With CB
Higher than CB00910
#8-40 Screws

Later Ridgeline
Based on Remington 700 Actions
Serial Numbers Starting With CV
#6-48 Screws

Mesa
Based on Remington 700 Actions
Serial Numbers Starting With CV
#6-48 Screws