Cheap as you have please. No chain ring needed.

For the spline one, need the bb too. Sold one last year and should have kept it.

Thanks

i am just in the process of swapping the crank on my ecr.

this is what they are,

Crankset SRAM NX Eagle 30T
Bottom Bracket SRAM Powerspline 118/73

any use?

Yes mate. For sure. That's what I'm after.