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The pumps are (were originally) manufactured by Rexroth (and later Delphi). "Parts" are not readily available for DIY work, and the pumps are extremely difficult to disassemble anyway. Your best (and probably only) bet is to by a re-man'd pump from someone, either aftermarket or from a dealer. They will want your old one as a core for rebuild. Shop around: prices and core fees vary from place to place.
I got mine (for my dual HPOP) from here several months ago: <u> CLICK ME
It's part #F81Z9A543CRM or F81Z9A543BRM, depending on the model-year (scroll down the page quite a ways). Looking at their web site now, it appears that the core charges have gone up (they were only $200).
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What years had 15° and which had 17° HPOP? Also, what is this number refering to?