Need A Recipe For A 273 Rebuild

Does anyone sell pistons for the 273 or are they all custom parts now ?

Kanter Automotive makes both the low as well as high compression slugs:

http://www.kanter.com//catalog/prod...0&Vdr=&Itm=&MDv=1&MDpt=0&MSb=0&Cat=32&Prc=362

Item # 12690E