Hello! You have provided the part numbers for the logic boards. The model number of the garage door opener may be on the other side of the garage door opener. You'll see a model number and a serial number listed near each other.
41AC150-1M appears to be 315 MHz
I could not find anything for part number 41D8169-1
You might also be able to find the frequency in your owners manual. Enter your full model number on www.SearsPartsDirect.com
for your owners manual.
If you need a new model, consider theses:sears.com/craftsman-series-100-garage-door-opener-with-two/p-A058447462?rrec=truesears.com/craftsman-1-2-hp-ac-garage-door-opener/p-00957933000P?rrec=true
Hope this helps!