I do not want to piss you off, but buyers need to know that a block like that without any caps is about worthless, as it will probably cost more than the price of the block and ride?
Main caps are machined to each block and almost never can be swapped with other blocks as they are final machined in place, and must have a perfect fit so there is no movement of the caps under heavy load.
Most owners do not know this and I would assume that you did not either when selling this block, so please do not be offended as I just want to uphold the integrity of this board for everyone.