Confused about hydraulic block for grapple

[Hiptfarms]

I'm planning on buying a grapple next week and am planning on using my rear remotes to power it - at least for now. But this afternoon I was taking a closer look at the hydraulic control joystick and block and noticed what I think may be an extra set of ports on the block that are not being used. Can anybody tell me if the two black circular gizmos in the pictures are covers for additional ports or just something else.

 

[oldnslo]

I suspect those are plugs covering the load checks.

 

[Hiptfarms]

I guess I'm not lucky after all. So back to the rear remotes then.