Here are the suspension balls from Tamiya. Cost around $6 to $7 plus shipping on eBay:
As for the suspension shafts, TamiyaUSA shows 46mm length for the front, and 48.5mm for the rear. The rear shaft part number is 9805681, and they come in a 4 pack. For the front, Tamiya sells two different types to fit different budgets. I seriously doubt the titanium coating will prevent bending though, so you should probably stick with regular steel for 1/4 the price:
And as an added bonus of useless information, you can get rid of those cheapo plastic spacers on the suspension shaft by purchasing the following hop-up. It contains 4 spacers of each thickness (.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm) with X.5mm spacers being silver, and X.0mm ones being blue. BTW: The 5.5mm named in the title refers to the spacers outer diameter. They are still proper 3mm inner diameter. I have no idea why Tamiya describes them this way:
