Chuggers are a knockoff of the 809/815 March pumps. The march/chugger and LG heads are not interchangeable. The spacing on the bolts is different on the two and iirc the march is smaller than a 3 series LG.
is this the style you are looking for?
I may have one from a TE series with the only difference being a 1/2" intake and a different material. If you are still looking I can grab some pictures tomorrow.
Most of the LG 2/3 series pumps have the same bolt spacing and the volutes can be interchanged. you will get slightly different performance out of the pump based on the volute selected, but rarely do we run the pumps where we need the maximum flow. Even whirlpooling with a 2 series LG pump or head is easier than with an 808/815/chugger due to the capacity of the 2 series.