It's hard to see from the pics if they're 4-way or not. If the holes in the base that the shaft passes through are round, they're 8-ways; if the holes are diamond shaped then they're 4-ways. Check Ponyboy's post in Buy/Sell/Trade for handles, he's got at least the red in 3.5, I dunno if he's got the right shade of blue. The Purple and Yellow are going to be tougher.
The buttons look like your garden variety short leafswitch buttons. Try Bob Roberts, Centsible Amusements, MikesArcade, ArcadeShop, QuarterArcade, LizardLickAmusements...