5 valves in a dozer?
That valve is steel, it's the same design as the aluminum bodied ones I get, though I don't know if it's the same guy making them in steel. Apparently only the steel valves can be had through Premacon...
I've never had a valve show up in the condition you described, Fumotec uses the same hyds (Jung pump & Meinhart aluminum valves) as Premacon... they could be really busy & getting sloppy, I'd be livid as I don't have 2mm tap for those holes not done... I would send a mail to tell them so.
The two 6mm fittings (4mm id hose) screw into output side of the pump & into input side of valve. Do you have two more larger fittings for a 6mm id hose to connect tank to pump? (I think that's the size, it's definitely larger than the output)
Are those the servos Premacon sent with the order or you picked on your own?