You could just buy some polyeurothane tube and cut to size. Should work out cheaper than the made to measure stuff from pace etc. I had a load until recently. You just need to know the hardness you need, and can order the right outside diameter, and buy the variety with the internal hole already done. You can drill it yourself but it's flexy and not easy to get right without a way of keeping it straight.
I forget the proper name of the material you'll need, but I think it is polyeurothane rod.
The pace mxcd elastomer is much narrower than the standard rc35 version and might work for you. I bought some a few years ago new, but it must have been sat around for a while as quite a few split when testing the fork after fitting, so if you went down this route, I'd check with pace that they are new, not new old stock.