I found both wheels new!
A Eureka Express power nozzle is a Beam Rugmaster Power nozzle which is still manufactured and available from Beam.
Eureka may not make the parts but Beam does. I've compared photos of my former Eureka Express canister vacuum cleaner and the baseplates and every detail seems to match up.
Model numbers for the Beam Rugmaster power nozzle can be as follows: 045389, 045322, 045320
The front wheels for the Beam Rugmaster Power nozzle are coming up as: 155413, they are $2.25 from the link below.
Here are more links with information to compare:
http://evacuumstore.com/p-2627-beam-genuine-rugmaster-plus-rp350-045389.aspx
http://www.centralvacuumdirect.com/beam-powerhead-bm1372aa-s/1917.htm
http://www.beamvac.com/Productcatalog/Productsseries/Power-Units/Serenity/Rugmaster-Plus-Cleaning-Set/
http://www.centralvacuumstores.com/central-vacuum/repair-and-replacement-parts/wheels-bushings-and-more/electrolux-155413-front-wheel
http://www.centralvacuumstores.com/central-vacuum/tools-and-attachments/power-heads/electric-powerheads/honeywell-honeywell-select-rugmaster-powerhead-045408
http://www.hescoinc.com/schematic/eureka/e_8260.pdf
Rear wheels for the canister suction unit are part number 26440-25. You can check the Hesco schematic for the Express line in link above!
http://www.searspartsdirect.com/part-number/26440-25/0020/860.html?utm_source=shoppingcom&utm_medium=cse&utm_term=26440-25&sid=SPDxSHPG
http://www.ebay.com/itm/Eureka-Express-Rally-World-Vac-Rear-Wheel-26440-25-/191002026001?hash=item2c789ba011:g:ZzsAAOxynZhR6S3F
[URL unfurl="true"]http://www.amazon.com/Eureka-EUREKA-26440-1-WHEEL-EXPRESS/dp/B001ICR9EO/ref=sr_1_3?ie=UTF8&qid=1460179013&sr=8-3&keywords=26440#[/URL]
[URL unfurl="true"]http://www.vacuumstore.com/product/155413.html[/URL]