If it helps, This is what I did:
Dryer outlet is old style 3 prong, I simply bought a dryer plug, and some rubber coated 10-4 service wire, two 4-gang boxes, one 3 prong and one 4-prong 240v dryer receptacle, and a 50a spa pak.
Oh, and a piece of 10 gauge wire about 10 feet long for ground for...