Scrape shoe sizes and availability

hi guys i am struggling to scrape one website. I have got shoes to scrape but each one has dynamic css selector so i am stucked right now. what i want is download sizes and availability.
availability is fine is downloading perfectly just sizes i cant find out correct css selector
E. g OR 676D006 Dámska terapeutická obuv
there is a class class="radio_pph2group_1419 pph2_proddet_selbox_active

different product has class="radio_pph2group_172 etc.

anyone willing to help me .

this is current sitemap

{"_id":"pigeon-obuviba","startUrl":["Zdravotná obuv ortopedická, ortopedické topánky, prezúvky click","type":"SelectorElementClick","parentSelectors":["title"],"selector":"div.pph2_allparams_holder","multiple":true,"delay":"1300","clickElementSelector":"label","clickType":"clickOnce","discardInitialElements":"discard-when-click-element-exists","clickElementUniquenessType":"uniqueCSSSelector"},{"id":"Availability","type":"SelectorText","parentSelectors":["element click"],"selector":".pph2_proddet_price_stockstatus_holder_above_price div.pph2_dostupnost","multiple":false,"regex":"","delay":0},{"id":"size","type":"SelectorText","parentSelectors":["element click"],"selector":"label.radio_pph2_proddet_selbox_active:containts","multiple":false,"regex":"","delay":0}]}