I expect the "Swiss Multiquick" shown in the SPI catalogue may be the same thing as the "Multifix". There are 6 sizes (smallest to largest): Aa, A, E, B, C and D.(Why it's not Aa,A,B,C,D and E I don't know). The A and the E calling for a minimum height above top of compound of 1 1/8 and 1 9/64 inches respectively look like the ones that would fit the 10EE. The min ht. above compound is based on using the maximum size bit in the turning and facing holder: 3/4" for the A and 1" for the E (there is also a 3/4" turning and facing holder for the E). Presumably the larger bit accounts for the apparently small increase in minimum center ht. described for the E. The A post itself is 2 1/8" high, the E is 2 5/8" high. Also the cut off blade holder for the A uses a 3/8" high blade, the one for the E a 5/8" high blade. The larger blade on the E may help with the adjustment problem Dave described. 2001 prices were $521.73 for the A and $667.59 for the E. Among the nifty tool holders shown are an external and an internal threading tool holder each with a lever to quickly withdraw the cutting tool, sort of like what's on the compound of the Hardinge. Unfortunately these tool holders cost more than the toolposts themselves. Turning and facing holders for the A are about $140, for the E about $170. I haven't seen these toolposts anywhere other than the SPI catalogue- not in Travers or J&L or MSC. Occasionally other tool supply companies issue the SPI catalogue with their own cover and additional pages- Penn Tool Co. has done this. I remember seeing tool posts like this in the ENCO catalogue years ago, don't have a current one around.
The center ht above compound on my 1977 10EE is 1 1/4", apparently that didn't change when they increased the swing by 1/2" in the 1940's. Aloris doesn't give minimum center ht above compound for their toolposts, but Dorian does, they list 7/8" for the AXA, 1 1/16" for the BXA and 1 1/4" for the CXA, so the BXA size looks most appropriate for the 10EE. As noted earlier, for some reason Aloris recommends the AXA in their catalogue for the 10EE. I use an AXA on mine because that's what I had when I sold my 10" South Bend. I'm making a 1/4" riser plate for it to possibly make up for its slightly too small size.
David