Coliseum series power switches v. Concert series

[RxJxVx]

After attempting a simple pilot light replacement, I now need to replace the power switch on my old Coliseum Bass head.  I've looked around online for a replacement, and the closest thing I think I've found is a replacement Concert series power switch, pictured here:

http://cgi.ebay.com/Sunn-Amp-Power-Switch-Concert-Lead-New-/140485314150?pt=LH_DefaultDomain_0&hash=item20b593c666#ht_2310wt_1141

Can anyone tell me whether the two switches are the same size, or can anyone tell me where to find the exact part that I need?

Thanks so much, and happy new year to all of you.