The grips are available for order. I emailed them recently. Their reply:
They are available to order.
The wood grip inserts, part # W01030 are available for $42.95
You can call our parts department 603-865-2442 with your serial number and they can supply what you need.
If you need further information, please visit our website at www.ruger.com
or contact us at:
Revolvers, shotguns, rifles, 10/22 Charger Pistol: (603) 865-2442
Pistols: (928) 778-6555
Serial Number History Information: (603) 865-2424