Try this as well:
https://www.runnersretreat.biz/category.asp?ID=25
This British vendor stocks Newline apparel (a Danish brand).
I bought several of these tri briefs.
They are true to european size, perhaps on the small side. M or L would be your best bet
Apart from the cycle pad (crotch and seat area), these are UNLINED, but perfectly opaque.