Not so rich so I can save every part when I buy something new. So a good chance for you to get a Cannondale Hollowgram SL crankset.
Cannondale Hollowgram SL 172,5mm crankarm for mtb or road, a lot of chainrings and parts with. See my add here: Weightweenies or just send me an e-mail if you want to buy all or some parts: firstname.lastname@example.org
Thought of mounting my FSA Gossamer on my SuperX with a 38t chainring I got with it. But found a better one, 40t from Stronglight I had laying around since my Allebike cx or even caad9cx I had some years ago. Mounted it with a bash (made for 42t) to get rid of the front derailleur:
Tried to mount a Deda dog fang on the inside but didn’t fit perfect with the oval tube, will try with a spacer (a.k.a old tube). Of is there any good thing to have on the inside mounted on the derailleurmount when you don’t have derailleur?