Figgy piston clearances

Hi all, I'm new here and love all the info you have.
I'm rebuilding my figgy engine after a seize and having trouble finding piston clearances for toyonisa pistons. I've got plus .50 micra pistons that have been spun down to 1mm dish (not 1.5mm of standard piston) to lower compression. I can only find guesswork on the Internet not any hard facts. A tight engine could be 2thou but I'm worried that when it's hot it might seize.
Can anybody help?

Also does anybody know which engine mounts are micra ones and which are figgy ones please? £100 each for figgy ones is a bit rich. Thanks in advance