Keep an eye on eBay and/or GB. You might also consider putting an add in the Want To Buy section of the forum, but be sure to read the rules there first.
wow! i had completely forgotten about those!! iirc, they are a bit thicker than the hogue car tires. greatest quality nevertheless. i believe that the thinest available grip other than factory oem, were the uncle mikes. and i think they were 3-piece. maybe not. too long ago to remember all. lol!