I purchased a barrel 10" Tele-Optar f/5.6. It came with a baby lens board (2.5" x 2.5"). I need a 3.68" square lensboard to fit my 4x5 Pacemaker Speed Graphic.

The hole in the baby lensboard measures 45mm wide. This doesn't match any standard Copal lens board sizes.

Where would I find the Graphic-style board with this hole size? Suggestions appreciated.

keh.com has two listed right now with a 45mm hole...

Just as a matter of reference, an orthodox lens board for a Pacemaker 45 is 3.71" x 3.65". A board 3.68" square won't go into the elevator frame.

Thanks for the help. I had some trouble mounting the lens on the lensboard. It was about 1mm too large to properly mount. With the help of a rubber o-ring from the plumbing store things are peachy-keen. My portraits are looking much better than what my 127mm lens was getting. Thanks!

Ah, yes, the old rubber O-ring trick. Thanks to that little item, I've got my 135 mounted on a 2x3 lensboard with an oversize hole. Much cheaper than correcting my mistake the right way!