On our 2014 Allegro Bus 37AP, you can get to the bulbs from inside the generator compartment. I ended up replacing one complete unit because a lens was cracked.
Amazon used to have them, but I see they have been discontinued.
Hella Optilux Model 1300 Round Driving Lamp Kit; Hella H71020051 Optilux 1300 Drv Rnd Blk
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