According to the parts site the 1900 came with either a draft control 3 point lift or a position control lift. The remote valves are different depending on which you have.

The part number for the remote valve kit for position control is SBA340010581.

The part number for the remote valve kit for draft control is SBA340010901.

Neither of them are available new any longer so you would have to find one at a tractor salvage yard. Someone is selling a used one for draft control on ebay right now, but they're over in the UK, but they do say that they will ship to the US:

Ford Compact Tractor Remote Hydraulic Control Valve 83924196 Double Acting | eBay

 

I don't know if it has draft control or not.

 

Here's a link to the parts diagram for the main 3 point control valve and related parts with position control:

Official New Holland Online Parts Store and Online Parts Catalog for New Holland and Ford Tractors.

And here is a link to the parts diagram for the main 3 point control valve and related parts with draft control:

Official New Holland Online Parts Store and Online Parts Catalog for New Holland and Ford Tractors.

Note that the second one (draft control) has two control handles. If you only have one handle then you should have position control and if you have two handles you should have draft control.

 

Thanks for the help. Will let you know if I find the parts.