[Standard] C510A HT's

[Bob Arenella]

 Mighty quiet here on the STANDARD reflector. Through an incredible stroke of luck, I've come into two NOS-NIB C510A HT's. One is S/N 78Uxxxxxx, the other 72Uxxxxxx. My question is, can either of these be modified for full 800 Mhz receive. I know that my C508A's could be modified, but not sure about these. 

Tnx & Merry Christmas,
Bob

P.S.      Sorry, neither of these is for sale.