Grease nipple for GU tailshaft

Hi,

I have a dilema and hope someone can help. I found a post from May 2005 from Austravel (PostID: 23234) who had the same problem that I have now. The grease nipple on my universal/tail shaft on a GU patrol is damaged. It's a 6mm x 0.75 pitch thread and has a 90 degree angle. I can't find anyone that has them including Enzed, Pirtec, fastener and automotive suppliers. Most places stocked a 6mm x 1 pitch.
Nissan can only supply the grease nipple with the universal joint at a cost of $130.
Seems ridiculous as my only option so far, as I was hoping to buy 6 of them and keep some spares in the toolbox.

Thanks
Alfred