LOCATOR Original Caps Selection Reference Chart. Which System Is This For? This is for the Locator Classic Original System. The Red Locator Caps have a retention of 0.5-1.5lbs /. The required tool for replacement of locator caps is either the Locator Core Tool (Part Number 08393), or the Universal Retention Caps Insertion/Extraction Tool (Part Number 488EIP-IQ). These caps are only compatible with the Classic Locator System. Red Locator Caps are available in packs of 4 or 20. The Following Graphic is a comparison of the Green Caps with the alternative Caps for the Classic Locator System.