My bad about the Sidekick II (which is made to fit the wider pin span of the hose end for the electric wands).
The Sidekick K119L in the white & capri color scheme matches the Lux 4000 and Lux 6000.
Regarding the nozzle with the brush strip, that was only the PN6. I've never seen an upright with that kind of nozzle, but I'd be interested in knowing if one or more actually did have it.
Here are engineering traits I observed of the Omni-Flo power nozzles (5s, 6s, & 7s) and the succeeding 1684, 1690s, 1720s, & 1750s (those used with more than one model typically had different ID tags and sometimes different colors; and occasionally tank cleaners were factory-paired with more than one successive pn model--likely as upgrades):
PN5 (1505/Silverado; gray 1453; 1521/DJ; Hi-Tech 2100; 1623/L-E): spring-loaded rear wheels, customary reset button, detachable power cord, metal brush roll guards, wide side channels
PN6 (1521/DJ; sand & jade 1453): spring-loaded rear wheels, 3-way switch, hard-wired cord, brush strip, metal brush roll guards
PN6A (1521/M & GM; sand & taupe 1453; Hi-Tech 2100; 2100/Special Edition; 1623/L-E & Regency Series 1000; 2100/Regency Series 2000) : spring-loaded rear wheels, 3-way switch, hard-wired cord, metal brush roll guards, wide side channels, corner channels
6B: (1623/L-E, Model 90, Special Edition, Regency Series 1000) spring-loaded rear wheels, 3-way switch, hard-wired cord, plastic brush roll guards, rear channel, corner channels
7B: (2100/Special Edition, Regency Series 2000; Hi-Tech 2100) stationary rear wheels, 3-way switch, hard-wired cord, plastic brush roll guards, rear channel, narrow side channels, corner channels
1622: (1521/L & U; 1623/Ambassador) spring-loaded rear wheels, 3-way switch, hard-wired cord, plastic brush roll guards, rear channel, corner channels
1684: (1762/Epic 6500SR; 1561 & 1569/Centralux?) spring-loaded rear wheels, customary reset button, hard-wired cord, plastic brush roll guards, rear channel, wide side channels, corner channels, front channels, headlight, electric elbow
1692 (sand cover--1521/U-LX) & 1693 (navy cover--1521/U-Cl; 1718/Epic 6000SR; black cover--1521/U-CE): spring-loaded rear wheels, 3-way switch, hard-wired cord, plastic brush roll guards, rear channel, narrow side channels, corner channels, headlight
1722--Regency Series 1500; 1723--1676/Ambassador II; 1724--1676/Ambassador III, 1725--1625/AdvantageSeries: stationary wheels, 3-way switch, hard-wired cord, plastic brush roll guards, narrow side channels, corner channels
1750 & 1752--Centralux ??; 1751--1676/Ambassador III; CB2000??: spring-loaded rear wheels, 3-way switch, hard-wired cord, plastic brush roll guards, rear channel, narrow side channels, front channels, headlight (1750 & 1752), no headlight (1751)
I'm pretty sure that I left out some details such as if any of the front rollers were designed to float as well as omitting commercial models PN5C, 6BC, & 7BC (and possibly others). Also, I'm not positive that the PN5 was the only nozzle to have a detachable cord--I'd heard that it was deemed problematic; so took for granted that it was only used on that model. In addition, I'm unsure of which power nozzles were used with the Centraluxes, whether some were factory-equipped with double-helix brush rolls, and if they all had the same motor (all were rated at 1.8 amps). In any event, it's obvious that there have been a variety of power nozzle engineering designs. I wonder just how many were used in the uprights (to my knowledge they weren't stamped with model IDs, but they were probably marked with part #s).
Btw, here's an estimated timeline of the models: Omni-Flos--1983-89; 1600s--1989-93; 1700s--1991-95 (the current alphanumeric model IDs were introduced in 1994 with the Renaissance C104A tank cleaner).
eBay Photos:
1)PN5
2)PN6
3)PN6A
4)6B
5)7B
6)1622
7)1684
8)1692
9)1725
10)1751
