Yeah it's the bolt holes, the s14 are bigger so I need some reducing sleeves to downsize to the original s13 size. I have the dimensions . They need to be 30mm long, have an I.D. of 11.91mm or .4685, and have an O.D. of 13.85mm or .5445
I didn't get the bolts with them, is an option I suppose, I've called an engineering company to get a quote on making some, waiting to hear back