It depends on your model number. The Kenmore 90 Series Washing Machine has many different models and, as such, many potential different part numbers. Your exact model number will help find the exact part number you need, and then we can see if that is available or not.
Even if it is no longer manufactured or sold at major appliance parts retailers, one alternative method of sourcing the right part is to find a "donor device" from a used appliance store or from eBay (or similar). You can harvest a device with a working timer and use that for your existing device. This may or may not be economical depending on how much the donor device costs.