Ampeg B-15N Dolly Question

I just bought a 1966 B-15N but it doesn't have the dolly. I have a lead for a blue tolex dolly that is from the "late 60s". The dolly is out of town so I can't see if it fits my amp before buying it.

Here's my question: Are all dollies compatible with any blue tolex era B-15N?
 
If it is a B-15N dolly you should be okay (B-18N dollys were larger). The feet on the dolly should be spaced 9" x 15.5" on center. Earlier (double baffle) cabinets didn't have the foot cups yet so it wasn't as critical, but your cabinet does. The overall size of the dolly should be 11" x 19".
 
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