SI dual valve spring & retainers?

[Initial DSM]

Got these off a race head i bought a few months ago ..3 springs were all broke and i wanted to see why they broke and if they sold replacement springs so i can make a complete set again ..anyone know what kind these are ..there dual springs with a big seat maybe SI valve's?..i been into dsm's for about 10 years and i never seen this happen not even on a stock spring

 

[Jeff@Slowboy]

They look like SI with Manley retainers. I believe can get them individually. I will send you a PM.

Oliver
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