Eccentric
Mister Wizard
There are tons of original bars.
3 McCulloch Chainsaw Bars and A Chain from Mac 250 Saws 18 20 22 | eBay
I have several in storage.
I've got a few 18-25" large Mac mount hardnoses squirreled away (that I'd part with) too. The longer bars (and the RN's) are staying with me however.
The 'roller nose' (actually an Oregon sprocket nose) bar in that ebay listing looks to have a D096 mount as used on Homelite XL series saws (XL-12, SXL-925, etc). The other two in the listing are certainly large Mac mount bars however.