This kit is used to plug all the power steering line holes after those lines were removed. They stay flush and out of the way.
 
Three (3) types of racks were made for 90-05 models:
One type for earlier NA Miata
One type for later NA Miatas. The NA racks are interchangable, in case you are considering in purchasing our depowered steering racks.
One NB type which is the same for 99-05 model years.
 
Each type uses slightly different plugs. This kit will include all plugs for all models so no need to worry if it's going to fit or not. You will just end up with one or two plugs that you will not use, depending on your model rack.