And the V&M kit is $375. But, depending on the attachment, it might be worth the extra money to be able operate the new attachment AND the FEL as opposed to OR with the V&M kit.
Check the flow rating of the valves you are looking at vs. the flow rating of your tractor hydraulics. The "add-a-valves" I got were only rated for 15 gpm vs more for the tractor. It kept popping the relief valve on the tractor. I went to a manual rated at 30 gpm and have not had any more problems.
Someone want to make me an offer on the valves I still have on the shelf?
If the flow is low and slow, you would not know that from mine.
I use it for the power-angle circuit on a Curtis 7.5' snow blade (QA'd on L5030HSTC with 853 FEL)
One click of the rocker and the blade snaps. I have to feather it carefully it is so fast.