opel-infos has this on their website:
Opel colour number 256 black starmist corresponds with GM colour code 90L, so correct match
https://www.opel-infos.de/farben/farbcode.html
Wankers like that should park up next to this Manta:
https://www.facebook.com/Dauerparker-Rüsselsheim-198950554027398
Sorry it's in German, but I guess you can tell what it's about from the pictures
Depends on what you want, 7x15 or 9x15.
Have a look on German eBay : https://www.ebay.de/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313.TR0.TRC0.H0.Xats+classic+7x15.TRS0&_nkw=ats+classic+7x15&_sacat=0
Welcome,
That's a nice hatch, great colour matches with the the black ATS wheels.
If you took the pictures yourself, can I ask what camera and lens you use?
Have you toyed with the idea of fitting no bumpers at all?
Can't remember where I've seen it, but you could use Frod Escort Mk1 quarter bumpers yo give it an Irmscher look.
They are available in fiberglass from https://www.motorsport-tools.com/new-escort-mk1-front-quarter-bumpers-fiberglass-rally.html
As far as I know there is only one manufacturer: Lenk Tuning.
front:
http://www.lenk-tuning.com/images/mantaa/mantaa20010.htm
rear:
http://www.lenk-tuning.com/images/mantaa/mantaa20014.htm