They're pretty easy to rebuild, just be careful working with the thing. Here's a link with pics http://nwforddiesel.com/cgi-bin/yabb...custompage=ipr
The little oring is a -12 size and big one -114 both are Viton and of 90 durameter hardness. I get em from my local Cat dealer. Watch the little one doesn't get damaged when replacing the ipr and make sure the thin nut holding that coil on is snug or it will make the truck run like poo.
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the  1997 F-350 XLT 7.3L PSD 4x4 CC LB BTS E40D Manual Hubs 4.10 36000 miles when purchased 4/1/06. Mods - ISSPRO Performax gauges, Tymar intake, Tymar 3x4 DP to 4" ss exhaust, electric fuel, CCV mod, tru-cool 4739, Swamps 175/30% injectors, stage I Stealth pump, D66 turbo  Spearco 6.0 cac, BDP live tuned tuned 442hp/860tq.
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