If you don't want to modify the stock pump you can buy this
Mazda racing pump from Racing Beat for about $866.
Probably will save a pound or two over the stock
pump as the stock pump has a cast iron cartridge and this
one looks like it is aluminum. Another benefit
is it comes with a side alternator mount.

BTW I think the stock water O-rings from Racing Beat are about $12 each.

Paul Lamar
 
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