Anyone on here know where I might be able to pick up some part for this model ride on

I've tried my local mower retailer and they said they are discontinued and cant match it to another part

These are the parts numbers and descriptions

NR - 45892 Bolt, 3/8 - 16 x1.5 car r

NR - 39659 Retainer, Strap belt

Any leads would be great

Thank