I already had to egg the bell bolt holes to get it to even accept the 0.021 dowels.
Robb said CNC'ing a 1-off part would be absurdly expensive. More than $100. He suggested drilling out the alignment pin holes, bolting it on, beating on it with a mallet until it was aligned, drilling out some washers to be snug-fit over the pins, slipping the washers over the pins and welding them to the bell, to keep it from moving.