Old in floor cleaning system

I inherited the pool that used to have an infloor cleaning system which has been removed by the previous owner. I do not know what brand the cleaning system was. The unit itself has been removed and the pipes sealed. Some of the pop up heads are missing leaving a few ugly looking holes in the pool bottom. I have no plans to reinstall the cleaning system. What is the best way to plug those holes, short of resurfacing the pool? Are there any commercially available plugs or covers?