Need a flywheel P/N cross reference (Briggs 21 hp Intek)

I need a new flywheel for a 21 hp Briggs model 331877 0869 G5.  This is an Intek engine for a riding mower.  The parts manual says the Flywheel is 698281.  But, every website I search says that P/N 698281 is no longer available or discontinued.  I have searched to find what P/N replaced this one, but nothing is clear.  I'm looking for guidance on how to find the correct P/N flywheel which I can purchase for my machine.  I appreciate any assistance..  Thank you..

Thanks Scott - I'll checked those out and made an offer on one..

Got the flywheel installed.  I'm at the end of a rebuild project..
 
- When this repair started, I thought I had a camshaft issue - but camshaft was perfect. (compression release spring, lobes, all good)
- The connecting rod was busted.  Had aluminum metal transfer to the crankshaft which I cleaned up.  
- Replaced piston, rings and rod. Cylinder sleeve was good. 
- Replaced the head / valve assembly with new assembly from Briggs.  That new assembly out of the box seemed all good to go so I put it on and confirmed the valve clearances.  I don't think I needed to do anything else with the valves..
- The dots on the cam / crank gears are timed.  (I wish this was easier to double check, but I'm sure they're aligned)
- Flywheel is in place with a new key in there
- I just took off the valve cover and valves seem to be moving good.  Full strokes.  
 
When I go to start it - it seems like timing is way off, or something similar to that.  While I hold the key, it fires, but there are huge back fires through the intake.  The air filter almost blows off.  It won't run.  
 
I need something else to check...