Now that you've done the 20 inch machine I guess you'll be also doing the 17 inch machine which would've originally come with a Kirby HK25 and also some H-4 4A's were fitted as OEM.
Only the 14's were ever fitted with Briggs units on Series One Machines.
Cheers, BB.
I live a 24 Hour lifestyle, but every now and again I seem to fall asleep, well at least that's what my wife tells me.