I am about 99.9% sure its a KK mower.
The deck braces, on the back half of the cutter going toward the tailwheel angle out. Kinda form a Trapezoid, and a nice radiused bend at the back. KK is the only one that does that. Country line, and IMC (the other two mowers I know TSC sold), the braces ran straight back just like they do in the front going up to the a-frame.
Rural king was the best place I found for getting blades, bolts, and stump jumper. But I have them local here. Shipping may be the deal breaker there and may be able to get cheaper online.
The blade bolts I think are just generic. I have a bushhog 306, A KK 5', A bushhog 105, and a IMC IM600 mower. They all use the same bolts. Just bought a set on ebay for ~$20. Rural king has them for ~ the same price
The blades are part # 501130 and cost me $47.99+tax at rural king for the set. A 5 pack of shear bolts is $7.49. The stump jumper, assuming a 40HP gearbox, is $100
Why do you need new blades???
Even with new blades + bolts + stump jumper.....should be ~$170. And rural king advertises free shipping on orders over $100