Looking on the internet deeply has found these results:

fewer components is the most popular phrase on the web.

lesser components 1125,000 results on the web	fewer components 1376,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
HEADLINE INFLATION AFFECTED BY VOLATILE COMPONENTS The volatile components of the HICP, in particular energy and to a lesser extent unprocessed food prices, largely explain the pattern of headline inflation in 2004 (see Chart 21). This decline is mostly explained by developments in the energy component, and to a lesser extent by developments in the intermediate and consumer goods components (see Chart 17). the separate component of equity associated with the hedged item is adjusted to the lesser of the following (in absolute amounts):	fewer repairs because of the increased longevity of components and longer intervals between services, With fewer cars and fewer components coming and going, goods transport is also affected. Some projects, in particular the water and sanitation component of the UN agency project in Indonesia, reached fewer beneficiaries than initially planned mainly due to an overestimation in the needs assessments.

lesser components

1125,000 results on the web

fewer components

1376,000 results on the web

More popular!

HEADLINE INFLATION AFFECTED BY VOLATILE COMPONENTS The volatile components of the HICP, in particular energy and to a lesser extent unprocessed food prices, largely explain the pattern of headline inflation in 2004 (see Chart 21).
This decline is mostly explained by developments in the energy component, and to a lesser extent by developments in the intermediate and consumer goods components (see Chart 17).
the separate component of equity associated with the hedged item is adjusted to the lesser of the following (in absolute amounts):

fewer repairs because of the increased longevity of components and longer intervals between services,
With fewer cars and fewer components coming and going, goods transport is also affected.
Some projects, in particular the water and sanitation component of the UN agency project in Indonesia, reached fewer beneficiaries than initially planned mainly due to an overestimation in the needs assessments.