I use the #2301 header on the OS33 and add a 4 1/2" extension to it. I show the set-up somewhere in the photos

The DLE35RA takes the same header FROMMACS PIPES (and not the hatori 2 piece unit), as used on the 140RX. They also show a new header for the 35; but I have and use the 140RX header on the 35, with opened up mounting holes to M5

The 35RA has enough power for the Vanquish and most any current 2 meter pattern model. It's not as powerful as the OS but the extra power isn't necessary. Personally I prefer the OS but it's your call.