So originally, an 826's hydraulic couplers would have been the Pioneer type female couplers. There would have originally been hoses that ran from the check valve blocks, down to the couplers themselves that were held in by a two-piece aluminum bracket, to give the couplers a breakaway, in the event that an implement came unhooked, so the hydraulic hoses would uncouple, rather than rip and tear. At some point, it appears your 826 was converted to the IH coupler blocks that are common to 66/86 series tractors. I'm guessing, at that time, the check valve block was removed from the RH valve/remote outlets. I've removed that check valve block as well from my 1256, many years ago. Have several of them laying in the spare parts shed.
The use of the steel hydraulic lines to the IH coupler blocks intrigues me, I'm wondering what application those lines were for? I'm thinking late 656/666/686, but I'm not certain.