Barry Grant/Holley 750 Double Pumper Base Plate Question

Hi,

I need to do some tuneup to the 750 Barry Grant (Gold Claw) double pumper, because the throttle blade shaft is leaking.
All 4 blades are stamped 1.69, but unfortunately I can't find more Infos on the base plate (numbers, letters, etc.).
Can someone please help me to identify the item?
I want to buy a new one, I don't want to rebuild it.
All base plates I found have the 1.75 blades (for example: Holley-QFT-AED CCS Billet Base Plate Assembly 1 11/16" 650-800 CFM Carburetors | eBay)
I think it would't be helpfull to select bigger blades.
Because I live in Germany, it isn't that easy to get Infos from a local shop :)

The best match I found is the base plate for a 750 Mighty Demon: Demon MAD-750-B2 750 CFM Aluminum Mighty Demon Carburetor

Here are some pictures of the part - Carb is stamped A12401

Workes great on an 1973 Duster, with 1979 360, 0.030, Speed pro Pistons (10,0:1), Comp Cam 292....

Thanks in advance, Eckhard ;-)