5.5. inch pull back risers for Yamaha Bolt

The 5.5 inch Milwaukee Twins pullback risers for Yamaha Bolt (maybe...)

The risers arrived (from J&P Cycles). No clue yet if I can get them to fit, but judging from everything I've Googled, it should be doable. I'll need to change the cables first AND source the bolts for the top clamps. The product info doesn't state what kind of bolts I need nor does it say anything on the package. Getting UNC bolts here in soviet Europe is not so easy. Most hardware stores don't stock UNC bolts to an extent that you could just march in a see what fits.

EDIT: apparently I need four 5/16"-18 x 7/8" bolts

SIDE NOTE
Inerestingly it seems that the Yamaha factory Apes or Tall Handlebars - 1TP-F61B0-V0-00 as they are officially called come with hard washers that replace the rubbers insert inside the triple tree. This is apparently to reduce the amount of play on the tall bars that by nature will have more leverage than the stock ones.

I found this out by watching the excellent Chaparral Motorsports handlebar installation video.

Jump to around 11:12 for the part showing the washers.

I've posted on the http://www.yamahastarbolt.com/ forums in hopes of getting good close up pictures of the washers and maybe even measurements. I don't want to buy the bars just to get a pair of washers. 

Screen grabs

Yamaha Bolt riser rubber washers still in place

The new "hard washer"

PLEASE, go visit http://www.chaparral-racing.com/ they deserve some business for doing such good videos