From the FSM:
The hydraulic lifters are a roller type design and are positioned in the cylinder block with the lubrication whole facing upward. The lifters are aligned and retained by a yoke and a retainer .
Lifter alignment is maintained by machined flats on lifter body. Lifters are fitted in pairs into six aligning yokes. The aligning yokes are secured by a yoke retainer .
Maybe they should proof-read the manual (lubrication whole).
2007 Stone White Rubicon