Where can I find parts for my older MTD tractor 136-744-300

Hi,
That one threw me for a loop for a bit. Could not think of who had a 300 vendor number and I got errors wherever I went. Then I though to use the generic MTD 000 vendor number and got a breakdown at Outdoor Distributors at:
http://www.outdoordistributors.com/pdf/MTD/MTD-136-744-000_(1986).pdf
And at OrderTree (Dixie Sales - largest distributor) on the ARI Network at:
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But if you notice on the second it lists four vendor numbers and none are 300. So try:
OrderTree (http://www.ordertree.com/partlist/model/view/id/199798/)
Or
Lawn Mower Parts and lawn tractor parts and more Outdoor Distributors - Lawn Mower Parts (http://www.outdoordistributors.com/)
But use 136-744-000 as the model or get the right numbers. All mechanical parts will be the same for the two, just paint colors and trim will vary.
Peace,
Clarke