Getting ready to remove and replace a section of cracked concrete around our diving board stand. Current board is mounted on bolts that are epoxied into the concrete. I would like to install a new "jig" in the fresh concrete. Can't find much info out there on what is recommended. Can't seem to find any jigs to purchase (4-1/2" bolts, 12 in. on center). I can purchase stainless "L" bolts to embed in the concrete. I could fab a new jig but I wonder if "L" bolts are just as effective. Any recommendations?