Those numbers contain the approximate belt length in the last 3 digits.
so 7430 = 43.0 inches   (1092mm)
and 7435 =  43.5 inches  (1105mm)

The first digit 7 is a width indicator, don't think it translates directly.

The power steering pump has vulnerable wires plugged to it so be careful
those are clear and undamaged during and after the installation.

Mark

Steve Williams wrote:
> Thanks, all.  Glad to know I can get back on the road quickly, without
> too much worry, if the accessories and pulleys are OK.
>
> No, I don't know what caused the belts to get thrown.  At least one of
> the belts has obvious damage, a spot where the ribs are missing for a
> few inches.  Otherwise I don't see damage.  But I haven't looked very
> closely.
>
> On 8/5/2018 12:30 PM, Dennis Haynes wrote:
>> 7430 for the power steering and 7435 for the alternator/water pump will
>> usually work just fine.
>
> Dennis, thanks for the Gates part numbers.  Even Amazon thinks those are
> the right belts for the Vanagon.
>