That's all the Idolmaster Poplinks art I care to upload, if anyone else is interested then the site still loads in the wayback machine, there's still a bunch of CG's and most Side-M's to upload, just have to inspect element to get the direct image links for both costumes on each character's page:
https://web.archive.org/web/20220813143441/https://poplinks.idolmaster-official.jp/idol/index.php?page=0&sh=true&sh_o=dU&sh_bp=&sh_bd=&sh_fw=