Suitcase weight recommendation for 445

Hello. Just purchased a used 445 w/ snow thrower, mid-mount deck and tiller. There were no weights included in the sale as the previous owner kept them for his new set-up (and I forgot to ask him for that info). What are the recommended number of weights to mount on the front when using the tiller? What is the part # for a bracket that attaches to the 3-point so the weights can be used when running with the snow thrower?

Thanks in advance for any responses.