Basically, there are long and short reach caps. If the bottle should use a long reach it will obviously fit but a short reach cap will go on but won't seal. If the bottle should have a short cap, a long one almost certainly won't squeeze down to fit.
I think there are 2 bottles, one for late B18 and one for B20. I think only the B20 one is available now. Not sure if they both used what I think is a long cap but Brookhouse says that if using the B20 bottle with a B18 you have to use the B20 bottle cap. I suspect that you have had the 144 long enough to have always used the correct cap but they are easy to measure and check.
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