IMHO, if you are sure that you will never need the slider in the future, I would go with the stationary anchors, and eliminate the slider as just one more moving part subject to wear and tear. However, if there is any chance that you might need the slider somewhere else down the line, then why not just replace the head, especially if no difference in cost.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.