Looking through the catalog I linked under connector accessories, I found this boot. You'd have to measure yours to see if it will work. PN is listed on the drawing. The size of this part looks as if it would work on the TPS plug. It's a start. No idea where you can order from.
I'll take a number off the connector tomorrow, I've noticed most of the booted connectors are like this. I also need to replace the TPS connector as it's green on the centre socket. I've managed to find them though.