Sync Adapters For A '81 GS1100E (help)

[JINKSTER]

Barely runs and barely ridable and he let it sit for a long time...I know I'm gonna hafta attack the carbs and want tro be able to sync them whem I'm done...I have a rack of vacume gages but need to know what sync adapters I'll need and where to get them.

T.I.A. Bill.