
The TP800 topside panel has been discontinued. The recommended replacement is the TP700, which is will fit in the existing hole and operate just as the old TP800 units did.
Here are links to the TP700 replacements:
Balboa - Topside Control Panel, Genuine TP700, w/o Overlay - G8470
Balboa - Topside Control Panel, TP700 - 57287 (With Overlay 17382)
Balboa - G8470 Topside Control Panel, TP700, 10 Button - 57280, 34-57280-K
Balboa - Topside Control Panel, TP700 - 57287 (With Overlay 17391)
Here are links to the TP800 replacement but in a different shape:
topside panel: OP33-1103-08
overlay sticker: OP11-1104-11