vocas mb250 77mm donut alternative?

[chrisxtharp]

so i got a vocas mb 250 it only has an 82mm donut, i need a 77mm one, they want 150 bucks for a pack of various sizes.

any suggestions on a donut that will fit thats 77ishmm?

 

[Martti Ekstrand]

Perhaps Redrock Micros

http://shopping.netsuite.com/s.nl/c.472981/it.A/id.665/.f

Otherwise you can get some thin black neoprene and cut out exactly the sizes you need yourself.