Yup, the second set is the same rims I just bought for my '93. MB Motoring "177" rims. They were a Discount Tire exclusive and if those don't come with the centercaps you can call Discount Tire and they *might* be able to find some. I thought I lost the ones for my rims and I called them up and they were about $17 each and they said the warehouse only had a few of them left because it is a discontinued rim.
If you are interested in the MB Motoring rims, ask the seller what they came off of. If they were off a GM, they should fit no problem as they will most likely have the 5X115 bolt pattern also