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@systemBuilder
Here is some info on 151 bcd rings - - -
Campagnolo, Sugino, and Shimano (Dura Ace) all offered 151 bcd rings at one point, in the late 60's. You can often find slightly used Sugino and Shimano rings on ebay for very low prices, some are in 1/8th and some are 3/32nd. NOS rings of this type are normally $100+, which leads us to a 2nd, cheaper alternative ....
There are at least 4 custom chainring makers in the world and they can make you a ring. This includes the mythical 43T 151 bcd ring that nobody ever sold as a brand-new item. The three sources for custom-made rings are :
a. Japan. CT Custom Chainring, but they may be closed by now.
http://velo-orange.blogspot.com/2007/02/ct-custom-chainring-shop-closing.html
b. U.K. Highpath Engineering.
http://www.highpath.net/
c. Australia. Probably the lowest-cost option. Cycle Underground.
http://cycleunderground.com.au/chainringdesigns.htm
d. USA. There is an individual that makes steel, titanium, and aluminum rings. I'm getting sick of googling and you'll have to look it up yourself. They serve the BMX or mountain-bike market. I never saw them advertise 151 bcd, but if they are making custom titanium rings, retooling for 151 bcd would probably not be difficult, and a titanium ring would last forever ...