Any suggestions for a pto boot cover?

[RuralRoute C-30]

When I bought this 1-ton dump this is how the PTO controls for the dump bed came from the PO.



Needless to say, a bit too much exposure to the weather like it is and, up to now, I just stuffed an old glove in it as a temporary "until I get around to it" solution. Now, after the recent clutch job I've reconnected the pto today and tidying up lose details while looking at this hole again for something more weather-proof.


Any idea is appreciated.

I do have an old rubber bed mat around for 'rubber parts'. Does anyone know of a rubber boot actually made for this or an idea on modifying an old one? Not even sure where to find one to start so any suggestions?

Thanks!
Mark