The price is a bit high (righties are typically under $500), but these are getting hard to find now. I can't even find their original website anymore, as it seems they only have a German site. They only made a handful of lefties, I believe. I found one on eBay a few years ago. The MM PUP isn't great, so I ended up purchasing a custom made lefty MM/J hybrid PUP from Proto Guitars. Now it has both a MM and J option on the single PUP.
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Spear Flextool:
http://www.ebay.com/itm/SPEAR-Gae-Bolg-Rosewood-SG-GBR-HG-LH-Left-Hand-Electric-Bass-Free-Shipping-/222292705082?hash=item33c1ad7f3a:g:XmMAAOSwHsRYDtMc
The replacement Proto Guitars PUP:
https://reverb.com/item/696140-proto-musicman-stingray-drop-in-replacement-pickup-jazz-humbucker