Flywheel questions

forgive my lack of knowledge on this topic.
I built a run/test stand. I friend of mine gave me a SB flywheel and bell housing.
The flywheel is 130 tooth and 6 bolt and measured 12.5”.
my crank is 8 bolt so I need to find a 8 bolt flywheel to bolt to the crank.
Is there a cheap flywheel that I can get? It only needs to idle on the run stand so I don’t need anything special.
Do I look for a 12.5” or what do I need?
This is the 6 bolt flywheel I have but need 8 bolt.

IMG_0826.jpeg