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Take a look at the complete set of the Caps and Tubes pack by Mark Tomlinson that contains a collection of 75 Sub-D kitbash parts for use in the Polystein Kit for Modo.
All mesh are quads and contain color separated regions for easy selection.
You can also buy each part separately:
Again, the Polystein Kit is a toolkit consisting of an array of all-quad SubD mesh presets that can be seamlessly added to a model making mesh detailing incredibly easy. This powerful toolset positions, scales, orients and auto-stitches these mesh presets to your active mesh relieving you of the tedious process of doing it manually.
You can find more details on the pack here.