Seems that all the plastic bits on my Sigma are falling apart.
Usually its a fix it with epoxy glue.

There was a nice puddle of water underneath the old beast.
Turns out the windscreen washer bottle just gave up, cracked and let out the wash.

Not seen anything that would fit as standard so it might have to be one of those universal replacements.
Anyone know of a better solution or where to get OEM?

the pump motor for sale is OEM

you will be better off with new plastic

there a a few different shapes of universal water bottles on Ebay

SCA to the resque.
They had a cheap kit ($19) that comprised of a small (1.5 Litre) bottle, pump and various bits.
After a bit of fidly metal work and fitting constraints this kit slotted in nicely.
Its identical to http://www.ebay.com.au/itm/SLIP-ON-WINDSCREEN-WIPER-WASHER-BOTTLE-KIT-UNIVERSAL-REPLACEMENT-12-VOLT-/252003731687#ht_1182wt_1124

Interestingly, in the old washer bottle there was a reed switch / float switch.
Initially I thought it was in series with the water pump, so that it would stop the pump from dry running.
But, with the float up, the reed switch is open circuit, so it must be a warning circuit.
Probably lights up a lamp somewhere on the instrument cluster (never seen it in 34 years!).

Good water pressure for such a cheap kit.