There are two "standard" size bullet connectors, 0.156 inch dia and 0.187 inch dia. I believe you want the 0.187 inch dia type. To get a less obvious reproduction terminal installation, remove the existing insulation from the terminal, crimp it in place (use a decent crimping tool, DO NOT USE VICE GRIPS), coat the crimped part with black liquid tape, available at Home Depot. Several coats are needed to build up the insulation. Liquid tape is quick drying, and uses acetone to clean up (i contacted the manufacturer about that).
Jim