I ordered a full set of six items from Midwest Control last Friday for $22 and change. They're not real big on communication and I had to call today to see if the order was even in the system. They said it was and should ship by tomorrow (9/9), so I should have them by Saturday ... maybe.
Meanwhile, I managed to find a WaVoil part number buried in my BH Owner's Manual and sent that to Shull at Progressive. He got back to me after waiting to hear from WaVoil and say he can get the parts from them for $22/each for the two alike and $13 for the single one, so $55/per side .... but they're in short supply and he can only get enough to do one side.
If the less costly generics from Midwest don't work, I'll have to go the higher priced route.
Plan is to goop between the boot neck and the joystick shaft and cinch a cable tie or hose clamp down there to eliminate water passage. I'll grease the insides with Marine grease also.
I'm still not sure who puts this backhoe together for LS or if parts are available from them.