different method of unsiezing a cailpers

[vrooom]

im having problem to remove the piston on outside side cailpers with no holes. the cailpers is cooper S.

so far i tried wd40 and plusgas over night, gas cooker cooking the cailper so expand the metal. and session on vice. still wont budge.

What to do? is it possible to buy cailper other halfs ? companies who do cailper exchange has dried up.

i have removed piston on inside side of cailper sucessfully.

there is about 5mm of piston showing. on siezed side.

What can i do?