Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
GM Buffalo bus
Table title:
Markets
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Years </th><th colspan=1 rowspan=1 > Model </th><th colspan=1 rowspan=1 > Quantity </th><th colspan=1 rowspan=1 > Model </th><th colspan=1 rowspan=1 > Quantity </th></tr>
<tr> <td colspan=1 rowspan=1 > 1966-69 </td><td colspan=1 rowspan=1 > PD-4107 </td><td colspan=1 rowspan=1 > 1,267 </td><td colspan=1 rowspan=1 > PD-4903 </td><td colspan=1 rowspan=1 > 401 </td></tr>
<tr> <td colspan=1 rowspan=1 > 1970-71 </td><td colspan=1 rowspan=1 > PD-4108 </td><td colspan=1 rowspan=1 > 65 </td><td class="highlighted"  colspan=1 rowspan=1 > PD-4905 </td><td colspan=1 rowspan=1 > 330 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1972-79 </td><td colspan=1 rowspan=1 > PD-4108A </td><td colspan=1 rowspan=1 > 232 </td><td class="highlighted"  colspan=1 rowspan=1 > P8M-4905A </td><td colspan=1 rowspan=1 > 2,002 </td></tr>
<tr> <td colspan=1 rowspan=1 > 1979-80 </td><td colspan=2 rowspan=1 >  </td><td colspan=1 rowspan=1 > H8H-649A </td><td colspan=1 rowspan=1 > 233 </td></tr>
<tr> <th colspan=1 rowspan=1 > Total </th><td colspan=1 rowspan=1 > 35-foot </td><td colspan=1 rowspan=1 > 1,564 </td><td colspan=1 rowspan=1 > 40-foot </td><td colspan=1 rowspan=1 > 2,966 </td></tr>
</table>
Question:
What happened to the PD-4905 of GM Buffalo bus in 1972?
Answer:
In 1972, the PD-4905 of GM Buffalo bus became P8M4905A.