Why low profile?A thinner belt flexes more easily, so it runs cooler and lasts longer on drives with small pulleys or idlers pressing on the back of the belt, where a standard belt would crack early.
Replace like for likeLow profile belts share the top width of A, B and C sections but sit differently in the groove. Swapping one for a standard classical belt changes the fit and drive ratio, so replace a low profile belt with a low profile belt.
Reading the codeThe code shows the range and section, such as SB for a RED-S II B section width, followed by the length. Match both the section and length from the old belt.