I'm restoring an early 1968 DT1 03306 and I'm trying to determine which later fork cover guides, if any, interchange with the early parts.I contacted Legends Yamaha Enduros first, and they suggested I ask here.I'm looking for firsthand knowledge from anyone who has actually compared these parts.Upper guide:

• Original 1968: 214-23115-00
• Later: 168-23115-00 and 278-23115-50
• Do these interchange?

Lower guide:

• Original 1968: 447-23116-52
• Later: 248-23116 or 278-23116
• Do these interchange?

I have one original lower guide but no upper guides. I've already compared my 1968 and 1971 DT1E fork parts and taken measurements, but before I start buying or machining later parts I'd really like to hear from someone who's physically compared these guides.Thanks!