Also our KOHLER tub has an odd oblong overflow cutout, so the standard one we ordered (which they forgot to put on our shipment too) won't work. We'll have to order the special custom one from KOHLER. We didn't know this when we ordered the tub. We might have chosen differently if we had known. The standard drain kit we were going to use is about $20. If I remember correctly the KOHLER one is about $90. So much for budget there.
Off to Home Depot I go to get this fixed. At least they brought the missing tile by already.