Here is an ebay link to a bunch of them.

Here is a link to Motorcycle Superstore for the ME880 in a 120/70-ZR19

Motorcycle Superstore has some really great prices. And shipping is free for anything over 75 bucks.

Depending on the distance between the legs on your girder you could easily run the 120. The added width between a 110 and a 120 is 0.4 inches. My brothers CBR600 has a 120 on the front and it looks just a tad beefier than my 110. Considering adding 10 mm to the width of the tire is making it 9% wider.

I recall us having this conversation a while back. And I think you had enough space to run the 120. Just check to make sure you have enough clearance for a 5 inch wide tire. A 120 tire on paper measures out to be 4.72 inches wide, but with the differences in manufacturing, it could be as wide as 5 inches or maybe just a bit more. But if you take a look at the DennisKirk website, you can see that the Metzeler ME880 120/70-19 is 4.5 inches wide when inflated and mounted on a 3 inch rim. Just take a look at the specs there. DK's website offers these measurements for a lot of tires. It's really helpful. And remember, if you decide to mount this on a thinner rim, it's going to make the tire thinner as well (by pinching the beads closer together).

Good luck Rev.