piston part number

[0X01B8]

This is probably a real long shot, but here goes.  I was wondering if anybody can identify this part number for pistons.   8263P30  This is on my engine build receipt from '92.  I know what the 30 means and the price for 8 of these was $199, which would be around $300 in todays money.  They're likely just stock cast pistons, but I was curious.  Thanks.

[Mick70RR]

A quick search tells me it's a Sealed Power piston but no further info.