Denny?
I have an extra best rear main for the 248 bmc, I am not sure if it exchanges with the 216 but It is a much better quality than what Victor supplied. As long as the channel profile in the cap is the same, the seal will work. I would cut it a little long and glue the ends. This Best seal fells more like the dogturd rope that was oem. I understand that they took the asbestos out and it has been hard to do as well without it. Langdon has the dogturd type, he may well just supply Bests himself.

Set me know, I'll send it.

Pgossett
See if it is the same part if so, I will send it to you to evaluate and use. I would also cut it a little long