Just went through the same search no luck. My car sat for 33 years and every bore had so much rust buildup. I had to sleeve the block, bore and hone,deck ect. I went with the standard bore pistons from Z Car Depot. I am very pleased with the way it worked out.I'm looking to buy pistons and rings in +.40mm. Preferably in the flat top variation. There seems to be a worldwide shortage of some kind. Please point me in the direction of some +.40 flat tops for the l28. 280zx or 280z since they're the same block, just as long as its flat top.
Thanks.