Product review (5 stars): WD12X10277 can replace axel studs for GE dishwasher model # GSD4930Z00WW instead of WD12X271 & WD12X10267 wheel+axel bundles.
The WD12X10277 can be used as replacement axel studs for GE dishwasher model GSD4930Z00WW for both the front and back wheels WD12X271 & WD12X10267, respectively (which are only sold as relatively expensive wheel+axel bundles).  The WD12X10277 fits perfectly and perhaps even better (more securely) than the original axel studs.

A few of my original axel studs had become brittle and broke but the wheels were fine so I didn't want to buy the relatively expensive wheel+axel bundles listed above (which were the only replacement parts listed in GE's manual for my model of dishwasher).  I gambled on these axel studs and they worked perfectly so I wrote this review to help others in the same situation.