An ST-745 appears to be a special bearing assembly used on the 38, 38A, 38C, 42, 44, 44A, 44C, 50, 50A & 50C decks for the spindle bearings. It looks to be a pair of ball bearings packaged into one case. I attached a picture off the web. A neat feature of this assembly is that you grease it from the top and the grease is dispersed into the interior cavity to both bearings.
Given the vast number of bearings out there, there stands a good chance a bearing that fits the OD/ID and overall construction (ball bearing-type) characteristics exists. A collar would need to be sourced to obtain the correct spacing for the bearings, but there again, something probably exists that would fit the application.
I have to do this to my deck before mowing season starts - it's an interesting situation. Do you spend the money up front for the bearings to save time in the end, or save the money up front to spend more time finding/applying a different solution? Either way should yield the same results (in theory).
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Mike  - Ramsey, MN
'65 100 - #126432
Options: V61's, 8.5" Tru-Powers, stock sleeve hitch, Xtreme sleeve hitch adapter
Attachments: Dad's 42" Dozer Blade & 38" 3-spindle deck, 42U deck, Homemade Sleeve Hitch Dethatcher & a QA36A Snowthrower
Mods: K301 Upgrade, IHinIN's clutch pivot upgrade, SST driveshaft, custom bar axles
"Why buy something shiny & new when you can save something old."
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