OE 55100-2Z000 — Back upper arm assembly for Hyundai / Kia

OE 55100-2Z000 is the factory reference for this back upper arm assembly on selected Hyundai / Kia models. The Applications table on this page lists the confirmed rows — check trim level and build year against your own fleet before ordering, because one reference can cover several body variants.

Aftermarket back upper arm assembly comes from tooling houses that hold the original drawings or licensed equivalents. KingMay sources from vetted factories and inspects each batch; the manufacturer name is available on request where your market requires origin documentation.

A supersession happens when the maker revises a back upper arm assembly and issues a new tail number. The revision normally changes a small physical detail rather than the fit. Where we know a supersession chain for 55100-2Z000 we list the current reference; ask our desk for written confirmation before a large order.

OEM means the part was produced for the vehicle maker's assembly line; aftermarket means it is made independently to the same engineering drawing. For a back upper arm assembly the practical gap is usually tooling age and packaging rather than fit, provided the tolerance class matches.

Four variables explain most of the spread: material grade, whether the goods are new production or clearance stock, packing format, and whether the quote is ex-works or landed. Ask for the material certificate alongside the price — that is what makes a comparison like-for-like.

Treat it as a wear item: inspect every 20,000-30,000 km and replace at the first sign of leakage, noise or performance loss. Real service life swings widely with climate, road surface and duty cycle, so mileage on its own is a weak indicator.