The PowerLine 6826 series unit was the BOL model of power nozzle canisters for Eureka. That is correct. The white model as seen in the JC Penney catalog and the blue model you have are the only 2 PowerLine models that I'm aware of.
The body style is a little different from the WorldVac in the following:
-- No swivel hose-- hose mounts where older style canisters did
-- No headlight
-- Cord wrap on base of machine with a swivel hook
-- Non- covered tool storage--- your machine is not missing a cover, it never came with one.
-- No gas pump handle/ no brush roll on/off
Overall they were a decently powered vacuum. They were sold at the same time as the World Vac series-- roughly 1992- 1998. The most common World Vac model was the red colored 6865B, which was the 2nd model up in the line above the black 6856. The 6856 World Vac also had no cord rewind and no headlight. But it had the World Vac body style which had the swivel hose. The red 6865B had a headlight and cord rewind but like the lower model World Vac and the Powerlines, it too did not have a cover for tool storage, nor a gas pump handle, nor a brush roll on/off switch. There were at least 2 other higher end models to the World Vac line which did include gas pump handle and other features. One was the blue from JC Penney and there was a dark green. Not sure if there were others too?
The sparkling glitter SmartVac line replaced the WorldVac series followed by the red 6874 Boss Limited canister. The Boss Limited had the WorldVac power nozzle and body style. It had covered tool storage and it had the newer style curved gas pump handle rather than the rectangular one from the Express canisters. For whatever reason, despite gas pump handle, brush roll on/off and other nice features, Eureka did not put a headlight on this model.
The Eureka Excalibur with the same power nozzle was their near TOL model with variable suction controls. Eureka did come out with the Eureka Europa canister too around 1996 which utilized their VGIII equipped Express power nozzle.
Like the World Vac canister, your World Vac does use the Type V bag. It also uses AR belts and brush roll is the same as a PowerLine/ Bravo/ Boss 12" upright. There are several designs available and you can get a new brush roll for around $16 online through researching various sources: Amazon, Discountcleaningproducts, eBay, eVacuumstore, crucialvacuum, govacuum, etc. Sadly I have not seen a HEPA or near HEPA cloth setup in V style. You probably could glue a Eureka V bag collar onto a Hoover S HEPA bag and that may work, if you were looking to boost the filtration.
Congrats on the great machine. Wands are easy to find through various sources. You could probably get a "new" hose on eBay for around $40. Just study it well to make sure it's a straight connection and not swivel top connection.