[TenTec] Probably a Long Shot...

[Stuart Rohre]

Just search Custom Quartz Crystal manufacturing; or see if International 
Crystals in Oklahoma City is still making them to order.

The only other option is a parts unit from a swap meet.

Well, there is a third idea:  Make up a tiny board that will mount the 
Sixxxx chip that digitally can be controlled to a wide range of 
frequencies.  You just want enough circuit to lock it on the needed HF 
frequencies you mentioned, or lock two of the circuits.  There should be 
enough room to double foam tape such a piece of Vector board circuit 
material inside the 515.

Stuart Rohre
K5KVH