4x5, I presume. The boards are metal and specific to 4x5 Cambos. Often offered on eBay.
Y'r Xenar is most probably a 135/4.7 and in a #0 shutter. To confirm: front and rear cells both threaded M29.5x0.5. The shutter is a Synchro-Compur P.
I have a 2x3 SC, which uses smaller boards than the 4x5. I also have many lenses on 2x3 Pacemaker Graphic boards. I sent SKGrimes a 2x3 Cambo board and a 2x3 Pacemaker Graphic front standard from which they made an adapter. You can do this. Glenn Evans (
www.glennview.com)
may be able to provide one ready-made. If you have just the one lens, it would be more cost effective to get a Cambo and a Graphic board for it and swap as needed.