The SBSG LX-10 Topside control panel will replace all previous "Peanut" topsides made by Spa Builders Support Group. 3-00-0139
EPROM LX-10/15 5.31 ALPHA replacement chip included (required for 5.31 revision or lower).3-60-1087
If your is an LX-05 with Software version 8.01, then this is the replacement topside control for your spa. (RE: Some Leisure Bay models, and others).