Bearings are available . Old style was a st-745.
New style as stated ad can get at auto parts store.
Take it apart and see which brg you have and if the housings are serviceable. The st-745 is available aftermarket- I think the best price is around $65/each. The replacement assemblies are ~ $155 each new. Both ways you can find used also. The tensioner idler pulley can be rough, the idler arm usually is ungreased even though there is a provision for a zerk. Spring and bolt might need replacement.
I've got mine apart right now. My deck looked quite clean and there were no play in the bearings. I had a bad idler and one bearing was a little rough. Took it a part and broke a second bearing. So rebuilding the idler arm, new idler pulley, bolts/nuts. I haven't decided on new st-745 bearings or new assemblies which are 2x the cost. Either way, the parts are getting a true epoxy primer and sealed to prevent corrosion. Pulleys have a bit of wear- lots of deep rust pits, but I presume if they are still solid- they will work.
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