diff --git a/src/wireviz/wv_bom.py b/src/wireviz/wv_bom.py
index 985084f..17f090a 100644
--- a/src/wireviz/wv_bom.py
+++ b/src/wireviz/wv_bom.py
@@ -16,13 +16,13 @@ def get_additional_component_table(harness: "Harness", component: Union[Connecto
     rows = []
     if component.additional_components:
         rows.append(["Additional components"])
-        for extra in component.additional_components:
-            qty = extra.qty * component.get_qty_multiplier(extra.qty_multiplier)
+        for part in component.additional_components:
+            qty = part.qty * component.get_qty_multiplier(part.qty_multiplier)
             if harness.mini_bom_mode:
-                id = get_bom_index(harness.bom(), extra)
-                rows.append(component_table_entry(f'#{id} ({extra.type.rstrip()})', qty, extra.unit))
+                id = get_bom_index(harness.bom(), part)
+                rows.append(component_table_entry(f'#{id} ({part.type.rstrip()})', qty, part.unit))
             else:
-                rows.append(component_table_entry(extra.description, qty, extra.unit, extra.pn, extra.manufacturer, extra.mpn))
+                rows.append(component_table_entry(part.description, qty, part.unit, part.pn, part.manufacturer, part.mpn))
     return rows
 
 def get_additional_component_bom(component: Union[Connector, Cable]) -> List[BOMEntry]:
@@ -116,10 +116,10 @@ def generate_bom(harness: "Harness") -> List[BOMEntry]:
     # add an incrementing id to each bom item
     return [{**entry, 'id': index} for index, entry in enumerate(bom, 1)]
 
-def get_bom_index(bom: List[BOMEntry], extra: AdditionalComponent) -> int:
+def get_bom_index(bom: List[BOMEntry], part: AdditionalComponent) -> int:
     """Return id of BOM entry or raise StopIteration if not found."""
     # Remove linebreaks and clean whitespace of values in search
-    target = tuple(clean_whitespace(v) for v in bom_types_group({**asdict(extra), 'item': extra.description}))
+    target = tuple(clean_whitespace(v) for v in bom_types_group({**asdict(part), 'item': part.description}))
     return next(entry['id'] for entry in bom if bom_types_group(entry) == target)
 
 def bom_list(bom: List[BOMEntry]) -> List[List[str]]: