Here's a site i just found, it's got all sorts of parts for imports and oversized pistons for the diesels!!!
http://www.japanparts.it/japan/INDEX.htm
i'm eye-ballin' the +.50 pistons... oh yeah...
also the site is italian... geuss i'll have to get a translator to e-mail them or somthing.
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-Old ride-82 Luv diesel 5spd with some upgrades
-Past rides-82 Sierra, 78 Coupe De'Ville, 91 2dr Blazer, 86 RX7, 86 Porsche 944T (rear-ended and totaled)
-Curr. rides- 1970 Ford LTD 4dr, 390 4Bbl, 2nd owner! With a few Extras

00' Civic beater...