I used VW/Audi pump and jets. Mine came from a SEAT Cordoba (or maybe an Ibiza?) And they are the same pump and jets used in lots of VW/Audi group cars.
The VW pump press fits into the VW washer bottle, but if you pull it out, you'll notice it has a sort or barb on the inlet side that the stock sierra hose pushes onto snugly.
As a result I'm running both pumps - stock sierra into VW. I have excellent washers
Fitting these requires two rectangular holes to be cut in the bonnet - I used a dremel with a small cutoff wheel.
I scored two complete pump, washer and hose sets from a pull it yourself wrecker for free.
There's lots of SEAT's in wreckers as they aren't worth anything second hand, and all the bits are VW-Audi generic so quite high quality and well engineered.
Steve.