Called PAC racing springs as an alternative and they recommended the following
PAC-1900 spring - identical to Crane #99839
PAC-R405 10 deg titanium retainer +0.050"
PAC-L8025 steel lock
PAC-S112 spring seat 0.060" thick
If required I can swap out for PAC-L8027 +0.050" locks and use shims to fine tune installed height once everything is mocked up.
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