It doesn't look like Langdon's offers the new HW anymore. Their linkage is a real Rube Goldberg item.
If the DGV/Carter is progressive, and you have the Z-bar linkage, I'd suggest the you go with that instead of the 5200/DFV. It would be easier to connect with the Z-bar. Heck, I'd be tempted to go with it, even if it's not progressive. It is new for $85, and air cleaners are more available.
If the DGV/Carter is progressive, and you have the Z-bar linkage, I'd suggest the you go with that instead of the 5200/DFV. It would be easier to connect with the Z-bar. Heck, I'd be tempted to go with it, even if it's not progressive. It is new for $85, and air cleaners are more available.