If you can't find the Rhino, another option is the Flexane 80 liquid as mentioned on another thread. That should be available locally at one of your industrial supply houses, although I don't know how it compares in price to the Rhino. Has been on my car for about 10 yrs now.
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=1135&forum=3&post_id=8828#forumpost8828 There are a couple of picts of my setup on posts 10 & 16. Some of the bushings work in pairs and have shoulders that fit into frame & body recesses. Probably there to prevent metal to metal contact & noise, so am not sure how important they are to maintain, but if you want to replicate those, you'll need a slightly different type of mold than the flat bottom or sawing them off.
Here is a link to info on the Flexane. You do want the liquid, not the putty.
http://www.freemansupply.com/DevconFlexane80Fle.htm EDIT: Was comparing hardness. Don't know about the original rubber or Steele's but Flexane is 87 which is pretty hard. Don't know what Rhino is. There are some silicone rubber mold compounds with a hardness of 45 that I think might work & available in smaller quantities as well. Larger quantities of a harder material of 57. I think the silicone can be colored, but if not, then maybe not appropriate. Haven't investigated that part--or the durability.
http://www.alumilite.com/ProdDetail.cfm?Category=Silicone%20Rubber&Name=QuickSetThis Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=15133